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DispAtCh group EntEr

利用GCD并行多个线程并且等待所有线程结束之后再执行其它任务 dispatch_group_t group = dispatch_group_create(); dispatch_group_async(group, dispatch_...

这里使用dispatch_async的意义在于SessionManager有一个公有的completionGroup属性 @property (nonatomic, strong, nullable) dispatch_group_t completionGroup; 个人感觉内部使用dispatch_group_async用来异步派发执行completionHandler回调是...

dispatchTouchEvent的执行顺序为: 首先触发ACTIVITY的dispatchTouchEvent 然后触发ACTIVITY的onUserInteraction 然后触发LAYOUT的dispatchTouchEvent 然后触发LAYOUT的onInterceptTouchEvent 这就解释了重写ViewGroup时必须调用super.dispatchT...

java.lang.NullPointerException at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3055) at android.view.View.getDisplayList(View.java:12775) at...

我们都知道触摸事件是从Activity的dispatchTouchEvent方法开始的。再调用父类的super.dispatchTouchEvent(ev),事件向派发。ViewGroup与View关系:View是android控件的最...

利用GCD并行多个线程并且等待所有线程结束之后再执行其它任务 dispatch_group_t group = dispatch_group_create(); dispatch_group_async(group, dispatch_...

dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0); dispatch_group_t group = dispatch_group_create(); ...

利用GCD并行多个线程并且等待所有线程结束之后再执行其它任务dispatch_group_tgroup=dispatch_group_create();dispatch_group_async(group,dispatch_get_global...

利用GCD并行多个线程并且等待所有线程结束之后再执行其它任务 dispatch_group_t group = dispatch_group_create(); dispatch_group_async(group, dispatch_...

利用GCD并行多个线程并且等待所有线程结束之后再执行其它任务 dispatch_group_t group = dispatch_group_create(); dispatch_group_async(group, dispatch_...

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