coderiding

我问了gitee官方号，后来让我加QQ群，官方解答是，gitee普通版的page不支持自动更新，pro版本才支持。唉，真的辣鸡，要不是github的加速被国内墙了，访问慢。我会用gitee，强烈要求实现自动更新。

coderiding

mx：借鉴了SVProgressHUD的方式


NSBundle *bundle = [NSBundle bundleForClass:[SVProgressHUD class]];
NSURL *url = [bundle URLForResource:@"SVProgressHUD" withExtension:@"bundle"];
NSBundle *imageBundle = [NSBundle bundleWithURL:url];
        
NSString *path = [imageBundle pathForResource:@"angle-mask" ofType:@"png"];
maskLayer.contents = (__bridge id)[[UIImage imageWithContentsOfFile:path] CGImage];
maskLayer.frame = _indefiniteAnimatedLayer.bounds;

coderiding

DEMO:https://github.com/awliu/demo_dispatch_group

dispatch_group 基本语法 
dispatch_group_t group =  dispatch_group_create(); 

dispatch_group_async(group, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ 
      // 执行第一个1个耗时的异步操作 
  }); 

dispatch_group_async(group, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ 

coderiding

主线程定时执行

@property (nonatomic, strong) dispatch_source_t timer; 

// 【主线程】：2秒后隔2秒执行1次共执行多次 
- (void)setupMainThreadJJGCDTimerWithStartTimeSinceNow:(float)satrttime interval:(float)intervaltime repeatcount:(int)repeatcount 
{ 
    dispatch_queue_t queue = dispatch_get_main_queue(); 
    self.timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, queue); 
    dispatch_time_t start = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(satrttime * NSEC_PER_SEC)); 

coderiding

主线程延迟

// 【主线程】：延迟2秒后执行1次 
- (void)setupMainThreadDelayInSecond:(float)second{ 
    double delayInSeconds = second; 
    dispatch_time_t time = dispatch_time(DISPATCH_TIME_NOW, delayInSeconds * NSEC_PER_SEC); 
    dispatch_after(time, dispatch_get_main_queue(), ^(void){ 
        // 执行事件 
        NSLog(@"setupMainThreadDelayInSecond------------%@", [NSThread currentThread]); 
    }); 

coderiding

方法1：使用dispatch_get_main_queue

dispatch_async( dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ 
       // 执行耗时的异步操作...CODE 
        NSLog(@" 处理子线程工作"); 
        [NSThread sleepForTimeInterval:2]; 

       dispatch_async(dispatch_get_main_queue(), ^{ 
          // 回到主线程，执行UI刷新操作 
          NSLog(@" 处理主线程工作"); 

coderiding

static dispatch_once_t onceToken; 
dispatch_once(&onceToken, ^{ 
   // 只执行1次的代码(这里面默认是线程安全的) 
}); 

coderiding

单例（初始化情况少）

//id 可以是任何类名 
+ (instancetype)sharedInstance{ 
     static id _instance; 
     static dispatch_once_t onceToken; 
     dispatch_once(&onceToken, ^{ 
        _instance = [[self alloc] init]; 
     }); 
     return _instance; 

coderiding

typedef void(^handler)(void);
typedef void(^completion)(BOOL finished);

@property handler handler;
@property completion completion;

coderiding

效果图链接：https://raw.githubusercontent.com/codeRiding/github_pic_0001/master/2020-03-26 21.01.10.gif

- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath {
    UIView* bgSelectionView = [UIView new];
    bgSelectionView.backgroundColor = [UIColor redColor];
    cell.selectedBackgroundView = bgSelectionView;
}

https://gist.github.com/0c984c8a7b66933d75ee2fe5041c4ce6