总结了几个月的东西终于能和大家分享了,不多说,直接看东西!


1、禁止手机睡眠


[UIApplication sharedApplication].idleTimerDisabled = YES;


2、隐藏某行cell


- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath

{

// 如果是你需要隐藏的那一行,返回高度为0

    if(indexPath.row == YouWantToHideRow)

        return 0; 

    return 44;

}


// 然后再你需要隐藏cell的时候调用

[self.tableView beginUpdates];

[self.tableView endUpdates];


3、禁用button高亮


button.adjustsImageWhenHighlighted = NO;

或者在创建的时候

 UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];


4、tableview遇到这种报错failed to obtain a cell from its dataSource


是因为你的cell被调用的早了。先循环使用了cell,后又创建cell。顺序错了

可能原因:1、xib的cell没有注册 2、内存中已经有这个cell的缓存了(也就是说通过你的cellId找到的cell并不是你想要的类型),这时候需要改下cell的标识


5、cocoa pods报这个错误:unable to access 'https://github.com/facebook/pop.git/': Operation timed out after 0 milliseconds with 0 out of 0 bytes received


解决办法:原因可能是网络问题,网络请求超时了,只需要重试就行了


6、cocoa pods 出现ERROR: While executing gem ... (Errno::EPERM)


解决办法:

https://segmentfault.com/q/1010000002926243


7、动画切换window的根控制器


// options是动画选项

[UIView transitionWithView:[UIApplication sharedApplication].keyWindow duration:0.5f options:UIViewAnimationOptionTransitionCrossDissolve animations:^{

        BOOL oldState = [UIView areAnimationsEnabled];

        [UIView setAnimationsEnabled:NO];

        [UIApplication sharedApplication].keyWindow.rootViewController = [RootViewController new];

        [UIView setAnimationsEnabled:oldState];

    } completion:^(BOOL finished) {


    }];


8、去除数组中重复的对象


NSArray *newArr = [oldArr valueForKeyPath:@“@distinctUnionOfObjects.self"];


9、编译的时候遇到 no such file or directory: /users/apple/XXX


是因为编译的时候,在此路径下找不到这个文件,解决这个问题,首先是是要检查缺少的文件是不是在工程中,如果不在工程中,需要从本地拖进去,如果发现已经存在工程中了,或者拖进去还是报错,这时候需要去build phases中搜索这个文件,这时候很可能会搜出现两个相同的文件,这时候,有一个路径是正确的,删除另外一个即可。如果删除了还是不行,需要把两个都删掉,然后重新往工程里拖进这个文件即可


build phases


10、iOS8系统中,tableView最好实现下-tableView: heightForRowAtIndexPath:这个代理方法,要不然在iOS8中可能就会出现显示不全或者无法响应事件的问题


11、iOS8中实现侧滑功能的时候这个方法必须实现,要不然在iOS8中无法侧滑


// 必须写的方法,和editActionsForRowAtIndexPath配对使用,里面什么不写也行

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {


}


12、三个通知


NSSystemTimeZoneDidChangeNotification监听修改时间界面的两个按钮状态变化

UIApplicationSignificantTimeChangeNotification 监听用户改变时间 (只要点击自动设置按钮就会调用) NSSystemClockDidChangeNotification 监听用户修改时间(时间不同才会调用)


13、SDWebImage本地缓存有时候会害人。如果之前缓存过一张图片,即使下次服务器换了这张图片,但是图片url没换,用sdwebimage下载下来的还是以前那张,所以遇到这种问题,不要先去怼服务器,清空下缓存再试就好了。


14、上线前注意:


1)、删掉代码中所有的测试代码

2)、如果后台有审核模式,提醒后台开启此模式

3)、主流程再跑一跑

4)、全局搜索waring,检查所有标记waring的地方


15、跳进app权限设置


// 跳进app设置

            if (UIApplicationOpenSettingsURLString != NULL) {

                NSURL *url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];

                [[UIApplication sharedApplication] openURL:url];

            }

        }


16、给一个view截图


UIGraphicsBeginImageContextWithOptions(view.bounds.size, YES, 0.0);

    [view.layer renderInContext:UIGraphicsGetCurrentContext()];

    UIImage *img = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();


17、开发中如果要动态修改tableView的tableHeaderView或者tableFooterView的高度,需要给tableView重新设置,而不是直接更改高度。正确的做法是重新设置一下tableView.tableFooterView = 更改过高度的view。为什么?其实在iOS8以上直接改高度是没有问题的,在iOS8中出现了contentSize不准确的问题,这是解决办法。


18、注意对象为nil的时候,调用此对象分类的方法不会执行


19、collectionView的内容小于其宽高的时候是不能滚动的,设置可以滚动:


collectionView.alwaysBounceHorizontal = YES;

collectionView.alwaysBounceVertical = YES;


20、设置navigationBar上的title颜色和大小


    [self.navigationController.navigationBar setTitleTextAttributes:@{NSForegroundColorAttributeName : [UIColor youColor], NSFontAttributeName : [UIFont systemFontOfSize:15]}]


21、颜色转图片


+ (UIImage *)cl_imageWithColor:(UIColor *)color {

  CGRect rect = CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);

  UIGraphicsBeginImageContext(rect.size);

  CGContextRef context = UIGraphicsGetCurrentContext();


  CGContextSetFillColorWithColor(context, [color CGColor]);

  CGContextFillRect(context, rect);


  UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

  UIGraphicsEndImageContext();


  return image;

}


22、view设置圆角


#define ViewBorderRadius(View, Radius, Width, Color)\

\

[View.layer setCornerRadius:(Radius)];\

[View.layer setMasksToBounds:YES];\

[View.layer setBorderWidth:(Width)];\

[View.layer setBorderColor:[Color CGColor]] // view圆角


23、强/弱引用


#define WeakSelf(type)  __weak typeof(type) weak##type = type; // weak

#define StrongSelf(type)  __strong typeof(type) type = weak##type; // strong


24、由角度转换弧度


#define DegreesToRadian(x) (M_PI * (x) / 180.0)


25、由弧度转换角度


#define RadianToDegrees(radian) (radian*180.0)/(M_PI)


26、获取图片资源


#define GetImage(imageName) [UIImage imageNamed:[NSString stringWithFormat:@"%@",imageName]]


27、获取temp


#define PathTemp NSTemporaryDirectory()


28、获取沙盒 Document


#define PathDocument [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject]


29、获取沙盒 Cache


#define PathCache [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) firstObject]


30、GCD代码只执行一次


#define kDISPATCH_ONCE_BLOCK(onceBlock) static dispatch_once_t onceToken; dispatch_once(&onceToken, onceBlock);


31、自定义NSLog


#ifdef DEBUG

#define NSLog(fmt, ...) NSLog((@"%s [Line %d] " fmt), __PRETTY_FUNCTION__, __LINE__, ##__VA_ARGS__)

#else

#define NSLog(...)

#endif


32、Font


#define FontL(s)             [UIFont systemFontOfSize:s weight:UIFontWeightLight]

#define FontR(s)             [UIFont systemFontOfSize:s weight:UIFontWeightRegular]

#define FontB(s)             [UIFont systemFontOfSize:s weight:UIFontWeightBold]

#define FontT(s)             [UIFont systemFontOfSize:s weight:UIFontWeightThin]

#define Font(s)              FontL(s)


33、FORMAT


#define FORMAT(f, ...)      [NSString stringWithFormat:f, ## __VA_ARGS__]


34、在主线程上运行


#define kDISPATCH_MAIN_THREAD(mainQueueBlock) dispatch_async(dispatch_get_main_queue(), mainQueueBlock);


35、开启异步线程


#define kDISPATCH_GLOBAL_QUEUE_DEFAULT(globalQueueBlock) dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), globalQueueBlocl);


36、通知


#define NOTIF_ADD(n, f)     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(f) name:n object:nil]

#define NOTIF_POST(n, o)    [[NSNotificationCenter defaultCenter] postNotificationName:n object:o]

#define NOTIF_REMV()        [[NSNotificationCenter defaultCenter] removeObserver:self]


37、随机颜色


+ (UIColor *)RandomColor {

    NSInteger aRedValue = arc4random() % 255;

    NSInteger aGreenValue = arc4random() % 255;

    NSInteger aBlueValue = arc4random() % 255;

    UIColor *randColor = [UIColor colorWithRed:aRedValue / 255.0f green:aGreenValue / 255.0f blue:aBlueValue / 255.0f alpha:1.0f];

    return randColor;

}


38、获取window


+(UIWindow*)getWindow {

    UIWindow* win = nil; //[UIApplication sharedApplication].keyWindow;

    for (id item in [UIApplication sharedApplication].windows) {

        if ([item class] == [UIWindow class]) {

            if (!((UIWindow*)item).hidden) {

                win = item;

                break;

            }

        }

    }

    return win;

}


39、修改textField的placeholder的字体颜色、大小


[textField setValue:[UIColor redColor] forKeyPath:@"_placeholderLabel.textColor"];

[textField setValue:[UIFont boldSystemFontOfSize:16] forKeyPath:@"_placeholderLabel.font"];

40、统一收起键盘


[[[UIApplication sharedApplication] keyWindow] endEditing:YES];


41、控制屏幕旋转,在控制器中写


/** 是否支持自动转屏 */

- (BOOL)shouldAutorotate {

    return YES;

}


/** 支持哪些屏幕方向 */

- (UIInterfaceOrientationMask)supportedInterfaceOrientations {

    return UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight;

}


/** 默认的屏幕方向(当前ViewController必须是通过模态出来的UIViewController(模态带导航的无效)方式展现出来的,才会调用这个方法) */

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {

    return UIInterfaceOrientationLandscapeLeft | UIInterfaceOrientationLandscapeRight;

}


42、获取app缓存大小


- (CGFloat)getCachSize {


    NSUInteger imageCacheSize = [[SDImageCache sharedImageCache] getSize];

    //获取自定义缓存大小

    //用枚举器遍历 一个文件夹的内容

    //1.获取 文件夹枚举器

    NSString *myCachePath = [NSHomeDirectory() stringByAppendingPathComponent:@"Library/Caches"];

    NSDirectoryEnumerator *enumerator = [[NSFileManager defaultManager] enumeratorAtPath:myCachePath];

    __block NSUInteger count = 0;

    //2.遍历

    for (NSString *fileName in enumerator) {

        NSString *path = [myCachePath stringByAppendingPathComponent:fileName];

        NSDictionary *fileDict = [[NSFileManager defaultManager] attributesOfItemAtPath:path error:nil];

        count += fileDict.fileSize;//自定义所有缓存大小

    }

    // 得到是字节  转化为M

    CGFloat totalSize = ((CGFloat)imageCacheSize+count)/1024/1024;

    return totalSize;

}


43、清理app缓存


- (void)handleClearView {

    //删除两部分

    //1.删除 sd 图片缓存

    //先清除内存中的图片缓存

    [[SDImageCache sharedImageCache] clearMemory];

    //清除磁盘的缓存

    [[SDImageCache sharedImageCache] clearDisk];

    //2.删除自己缓存

    NSString *myCachePath = [NSHomeDirectory() stringByAppendingPathComponent:@"Library/Caches"];

    [[NSFileManager defaultManager] removeItemAtPath:myCachePath error:nil];

}


44、模型转字典


static NSSet *classes;


- (NSMutableDictionary *)getParameterDictionary {


    NSMutableDictionary *dict = [NSMutableDictionary dictionary];


    Class c = self.class;


    while (c) {

        unsigned count;

        objc_property_t *properties = class_copyPropertyList([c class], &count);


        for (int i = 0; i < count; i++) {

            NSString *key = [NSString stringWithUTF8String:property_getName(properties[i])];

            dict[key] = [self valueForKey:key];

        }

        free(properties);


        // 获得父类

        c = class_getSuperclass(c);


        if ([self isClassFromFoundation:c]) break;

    }

    return dict;

}


- (BOOL)isClassFromFoundation:(Class)c

{

    if (c == [NSObject class] || c == [NSManagedObject class]) return YES;


    __block BOOL result = NO;

    [[self foundationClasses] enumerateObjectsUsingBlock:^(Class foundationClass, BOOL *stop) {

        if ([c isSubclassOfClass:foundationClass]) {

            result = YES;

            *stop = YES;

        }

    }];

    return result;

}


- (NSSet *)foundationClasses

{

    if (classes == nil) {

        // 集合中没有NSObject,因为几乎所有的类都是继承自NSObject,具体是不是NSObject需要特殊判断

        classes = [NSSet setWithObjects:

                              [NSURL class],

                              [NSDate class],

                              [NSValue class],

                              [NSData class],

                              [NSError class],

                              [NSArray class],

                              [NSDictionary class],

                              [NSString class],

                              [NSAttributedString class], nil];

    }

    return classes;

}


45、交换两个方法实现


Class aClass = [self class]; 


        SEL originalSelector = @selector(viewWillAppear:); 

        SEL swizzledSelector = @selector(xxx_viewWillAppear:); 


        Method originalMethod = class_getInstanceMethod(aClass, originalSelector); 

        Method swizzledMethod = class_getInstanceMethod(aClass, swizzledSelector); 


        BOOL didAddMethod = 

            class_addMethod(aClass, 

                originalSelector, 

                method_getImplementation(swizzledMethod), 

                method_getTypeEncoding(swizzledMethod)); 


        if (didAddMethod) { 

            class_replaceMethod(aClass, 

                swizzledSelector, 

                method_getImplementation(originalMethod), 

                method_getTypeEncoding(originalMethod)); 

        } else { 

            method_exchangeImplementations(originalMethod, swizzledMethod); 

        }


46、打印百分号和引号


    NSLog(@"%%");

    NSLog(@"\"");


47、几个常用权限判断


    if ([CLLocationManager authorizationStatus] ==kCLAuthorizationStatusDenied) {

        NSLog(@"没有定位权限");

    }

    AVAuthorizationStatus statusVideo = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];

    if (statusVideo == AVAuthorizationStatusDenied) {

        NSLog(@"没有摄像头权限");

    }

    //是否有麦克风权限

    AVAuthorizationStatus statusAudio = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeAudio];

    if (statusAudio == AVAuthorizationStatusDenied) {

        NSLog(@"没有录音权限");

    }

    [PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {

        if (status == PHAuthorizationStatusDenied) {

            NSLog(@"没有相册权限");

        }

    }];


48、获取手机型号


    + (NSString *)getDeviceInfo {

    struct utsname systemInfo;

    uname(&systemInfo);

    NSString *platform = [NSString stringWithCString:systemInfo.machine encoding:NSASCIIStringEncoding];

    if ([platform isEqualToString:@"iPhone1,1"]) return @"iPhone 2G";

    if ([platform isEqualToString:@"iPhone1,2"]) return @"iPhone 3G";

    if ([platform isEqualToString:@"iPhone2,1"]) return @"iPhone 3GS";

    if ([platform isEqualToString:@"iPhone3,1"]) return @"iPhone 4";

    if ([platform isEqualToString:@"iPhone3,2"]) return @"iPhone 4";

    if ([platform isEqualToString:@"iPhone3,3"]) return @"iPhone 4";

    if ([platform isEqualToString:@"iPhone4,1"]) return @"iPhone 4S";

    if ([platform isEqualToString:@"iPhone5,1"]) return @"iPhone 5";

    if ([platform isEqualToString:@"iPhone5,2"]) return @"iPhone 5";

    if ([platform isEqualToString:@"iPhone5,3"]) return @"iPhone 5c";

    if ([platform isEqualToString:@"iPhone5,4"]) return @"iPhone 5c";

    if ([platform isEqualToString:@"iPhone6,1"]) return @"iPhone 5s";

    if ([platform isEqualToString:@"iPhone6,2"]) return @"iPhone 5s";

    if ([platform isEqualToString:@"iPhone7,1"]) return @"iPhone 6 Plus";

    if ([platform isEqualToString:@"iPhone7,2"]) return @"iPhone 6";

    if ([platform isEqualToString:@"iPhone8,1"]) return @"iPhone 6s";

    if ([platform isEqualToString:@"iPhone8,2"]) return @"iPhone 6s Plus";

    // 日行两款手机型号均为日本独占,可能使用索尼FeliCa支付方案而不是苹果支付

    if ([platform isEqualToString:@"iPhone9,1"])    return @"国行、日版、港行iPhone 7";

    if ([platform isEqualToString:@"iPhone9,2"])    return @"港行、国行iPhone 7 Plus";

    if ([platform isEqualToString:@"iPhone9,3"])    return @"美版、台版iPhone 7";

    if ([platform isEqualToString:@"iPhone9,4"])    return @"美版、台版iPhone 7 Plus";

    if ([platform isEqualToString:@"iPhone8,4"]) return @"iPhone SE";

    if ([platform isEqualToString:@"iPod1,1"]) return @"iPod Touch 1G";

    if ([platform isEqualToString:@"iPod2,1"]) return @"iPod Touch 2G";

    if ([platform isEqualToString:@"iPod3,1"]) return @"iPod Touch 3G";

    if ([platform isEqualToString:@"iPod4,1"]) return @"iPod Touch 4G";

    if ([platform isEqualToString:@"iPod5,1"]) return @"iPod Touch 5G";

    if ([platform isEqualToString:@"iPad1,1"]) return @"iPad 1G";

    if ([platform isEqualToString:@"iPad2,1"]) return @"iPad 2";

    if ([platform isEqualToString:@"iPad2,2"]) return @"iPad 2";

    if ([platform isEqualToString:@"iPad2,3"]) return @"iPad 2";

    if ([platform isEqualToString:@"iPad2,4"]) return @"iPad 2";

    if ([platform isEqualToString:@"iPad2,5"]) return @"iPad Mini 1G";

    if ([platform isEqualToString:@"iPad2,6"]) return @"iPad Mini 1G";

    if ([platform isEqualToString:@"iPad2,7"]) return @"iPad Mini 1G";

    if ([platform isEqualToString:@"iPad3,1"]) return @"iPad 3";

    if ([platform isEqualToString:@"iPad3,2"]) return @"iPad 3";

    if ([platform isEqualToString:@"iPad3,3"]) return @"iPad 3";

    if ([platform isEqualToString:@"iPad3,4"]) return @"iPad 4";

    if ([platform isEqualToString:@"iPad3,5"]) return @"iPad 4";

    if ([platform isEqualToString:@"iPad3,6"]) return @"iPad 4";

    if ([platform isEqualToString:@"iPad4,1"]) return @"iPad Air";

    if ([platform isEqualToString:@"iPad4,2"]) return @"iPad Air";

    if ([platform isEqualToString:@"iPad4,3"]) return @"iPad Air";

    if ([platform isEqualToString:@"iPad4,4"]) return @"iPad Mini 2G";

    if ([platform isEqualToString:@"iPad4,5"]) return @"iPad Mini 2G";

    if ([platform isEqualToString:@"iPad4,6"]) return @"iPad Mini 2G";

    if ([platform isEqualToString:@"i386"]) return @"iPhone Simulator";

    if ([platform isEqualToString:@"x86_64"]) return @"iPhone Simulator";

    return platform;

}


49、长按复制功能


- (void)viewDidLoad

{

    [self.view addGestureRecognizer:[[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(pasteBoard:)]];

}

- (void)pasteBoard:(UILongPressGestureRecognizer *)longPress {

    if (longPress.state == UIGestureRecognizerStateBegan) {

        UIPasteboard *pasteboard = [UIPasteboard generalPasteboard];

        pasteboard.string = @"需要复制的文本";

    }

}


50、cocoapods升级


在终端执行 sudo gem install -n / usr / local / bin cocoapods --pre


51、设置启动页后,依然显示之前的


删除app,手机重启,重新安装


52、判断图片类型


//通过图片Data数据第一个字节 来获取图片扩展名

- (NSString *)contentTypeForImageData:(NSData *)data

{

    uint8_t c;

    [data getBytes:&c length:1];

    switch (c)

    {

        case 0xFF:

            return @"jpeg";


        case 0x89:

            return @"png";


        case 0x47:

            return @"gif";


        case 0x49:

        case 0x4D:

            return @"tiff";


        case 0x52:

        if ([data length] < 12) {

            return nil;

        }


        NSString *testString = [[NSString alloc] initWithData:[data subdataWithRange:NSMakeRange(0, 12)] encoding:NSASCIIStringEncoding];

        if ([testString hasPrefix:@"RIFF"]

            && [testString hasSuffix:@"WEBP"])

        {

            return @"webp";

        }


        return nil;

    }


    return nil;

}


53、获取手机和app信息


NSDictionary *infoDictionary = [[NSBundle mainBundle] infoDictionary];  

 CFShow(infoDictionary);  

// app名称  

 NSString *app_Name = [infoDictionary objectForKey:@"CFBundleDisplayName"];  

 // app版本  

 NSString *app_Version = [infoDictionary objectForKey:@"CFBundleShortVersionString"];  

 // app build版本  

 NSString *app_build = [infoDictionary objectForKey:@"CFBundleVersion"];  




    //手机序列号  

    NSString* identifierNumber = [[UIDevice currentDevice] uniqueIdentifier];  

    NSLog(@"手机序列号: %@",identifierNumber);  

    //手机别名: 用户定义的名称  

    NSString* userPhoneName = [[UIDevice currentDevice] name];  

    NSLog(@"手机别名: %@", userPhoneName);  

    //设备名称  

    NSString* deviceName = [[UIDevice currentDevice] systemName];  

    NSLog(@"设备名称: %@",deviceName );  

    //手机系统版本  

    NSString* phoneVersion = [[UIDevice currentDevice] systemVersion];  

    NSLog(@"手机系统版本: %@", phoneVersion);  

    //手机型号  

    NSString* phoneModel = [[UIDevice currentDevice] model];  

    NSLog(@"手机型号: %@",phoneModel );  

    //地方型号  (国际化区域名称)  

    NSString* localPhoneModel = [[UIDevice currentDevice] localizedModel];  

    NSLog(@"国际化区域名称: %@",localPhoneModel );  


    NSDictionary *infoDictionary = [[NSBundle mainBundle] infoDictionary];  

    // 当前应用名称  

    NSString *appCurName = [infoDictionary objectForKey:@"CFBundleDisplayName"];  

    NSLog(@"当前应用名称:%@",appCurName);  

    // 当前应用软件版本  比如:1.0.1  

    NSString *appCurVersion = [infoDictionary objectForKey:@"CFBundleShortVersionString"];  

    NSLog(@"当前应用软件版本:%@",appCurVersion);  

    // 当前应用版本号码   int类型  

    NSString *appCurVersionNum = [infoDictionary objectForKey:@"CFBundleVersion"];  

    NSLog(@"当前应用版本号码:%@",appCurVersionNum);


54、获取一个类的所有属性


id LenderClass = objc_getClass("Lender");

unsigned int outCount, i;

objc_property_t *properties = class_copyPropertyList(LenderClass, &outCount);

for (i = 0; i < outCount; i++) {

    objc_property_t property = properties[i];

    fprintf(stdout, "%s %s\n", property_getName(property), property_getAttributes(property));

}


55、image圆角


- (UIImage *)circleImage

{

    // NO代表透明

    UIGraphicsBeginImageContextWithOptions(self.size, NO, 1);

    // 获得上下文

    CGContextRef ctx = UIGraphicsGetCurrentContext();

    // 添加一个圆

    CGRect rect = CGRectMake(0, 0, self.size.width, self.size.height);

    // 方形变圆形

    CGContextAddEllipseInRect(ctx, rect);

    // 裁剪

    CGContextClip(ctx);

    // 将图片画上去

    [self drawInRect:rect];

    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return image;

}


56、image拉伸


+ (UIImage *)resizableImage:(NSString *)imageName

{

    UIImage *image = [UIImage imageNamed:imageName];

    CGFloat imageW = image.size.width;

    CGFloat imageH = image.size.height;

    return [image resizableImageWithCapInsets:UIEdgeInsetsMake(imageH * 0.5, imageW * 0.5, imageH * 0.5, imageW * 0.5) resizingMode:UIImageResizingModeStretch];

}

57、JSON字符串转字典


+ (NSDictionary *)parseJSONStringToNSDictionary:(NSString *)JSONString {

    NSData *JSONData = [JSONString dataUsingEncoding:NSUTF8StringEncoding];

    NSDictionary *responseJSON = [NSJSONSerialization JSONObjectWithData:JSONData options:NSJSONReadingMutableLeaves error:nil];

    return responseJSON;

}


58、身份证号验证


- (BOOL)validateIdentityCard {

    BOOL flag;

    if (self.length <= 0) {

        flag = NO;

        return flag;

    }

    NSString *regex2 = @"^(\\d{14}|\\d{17})(\\d|[xX])$";

    NSPredicate *identityCardPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex2];

    return [identityCardPredicate evaluateWithObject:self];

}


59、获取设备mac地址


+ (NSString *)macAddress {

    int                 mib[6];

    size_t              len;

    char                *buf;

    unsigned char       *ptr;

    struct if_msghdr    *ifm;

    struct sockaddr_dl  *sdl;


    mib[0] = CTL_NET;

    mib[1] = AF_ROUTE;

    mib[2] = 0;

    mib[3] = AF_LINK;

    mib[4] = NET_RT_IFLIST;


    if((mib[5] = if_nametoindex("en0")) == 0) {

        printf("Error: if_nametoindex error\n");

        return NULL;

    }


    if(sysctl(mib, 6, NULL, &len, NULL, 0) < 0) {

        printf("Error: sysctl, take 1\n");

        return NULL;

    }


    if((buf = malloc(len)) == NULL) {

        printf("Could not allocate memory. Rrror!\n");

        return NULL;

    }


    if(sysctl(mib, 6, buf, &len, NULL, 0) < 0) {

        printf("Error: sysctl, take 2");

        return NULL;

    }


    ifm = (struct if_msghdr *)buf;

    sdl = (struct sockaddr_dl *)(ifm + 1);

    ptr = (unsigned char *)LLADDR(sdl);

    NSString *outstring = [NSString stringWithFormat:@"%02X:%02X:%02X:%02X:%02X:%02X",

                           *ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4), *(ptr+5)];

    free(buf);


    return outstring;

}


60、导入自定义字体库


1、找到你想用的字体的 ttf 格式,拖入工程

2、在工程的plist中增加一行数组,“Fonts provided by application”

3、为这个key添加一个item,value为你刚才导入的ttf文件名

4、直接使用即可:label.font = [UIFont fontWithName:@"你刚才导入的ttf文件名" size:20.0];


61、拿到当前正在显示的控制器,不管是push进去的,还是present进去的都能拿到


- (UIViewController *)getVisibleViewControllerFrom:(UIViewController*)vc {

    if ([vc isKindOfClass:[UINavigationController class]]) {

        return [self getVisibleViewControllerFrom:[((UINavigationController*) vc) visibleViewController]];

    }else if ([vc isKindOfClass:[UITabBarController class]]){

        return [self getVisibleViewControllerFrom:[((UITabBarController*) vc) selectedViewController]];

    } else {

        if (vc.presentedViewController) {

            return [self getVisibleViewControllerFrom:vc.presentedViewController];

        } else {

            return vc;

        }

    }

}


62、runtime为一个类动态添加属性


// 动态添加属性的本质是: 让对象的某个属性与值产生关联

        objc_setAssociatedObject(self, WZBPlaceholderViewKey, placeholderView, OBJC_ASSOCIATION_RETAIN_NONATOMIC);


63、获取runtime为一个类动态添加的属性


objc_getAssociatedObject(self, WZBPlaceholderViewKey);


64、KVO监听某个对象的属性


// 添加监听者

[self addObserver:self forKeyPath:property options:NSKeyValueObservingOptionNew context:nil];


// 当监听的属性值变化的时候会来到这个方法

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {

    if ([keyPath isEqualToString:@"property"]) {

       [self textViewTextChange];

       } else {

     }

}


65、Reachability判断网络状态


NetworkStatus status = [[Reachability reachabilityForInternetConnection] currentReachabilityStatus];

    if (status == NotReachable) {

        NSLog(@"当前设备无网络");

    }

    if (status == ReachableViaWiFi) {

        NSLog(@"当前wifi网络");

    }

    if (status == NotReachable) {

        NSLog(@"当前蜂窝移动网络");

    }



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作者:佚名
来源:Cocoa开发者社区