替代NSTimer的block計時器！！ !

標籤：

既然NSTimer容易造成記憶體泄露，那就給初出茅廬的小程式員們帶來一個驚喜吧！
話不多說上代碼：
LIST

-(void)startTime{    timeout_int=0;    dispatch_queue_t queue_global =dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);    dispatch_source_t _timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0,0,queue_global);    dispatch_source_set_timer(_timer,dispatch_walltime(NULL, 0),1.0*NSEC_PER_SEC, 0);    dispatch_source_set_event_handler(_timer, ^{        __weak ViewController *weakself =self ;        if(timeout_int>10){ //倒計時結束，關閉            dispatch_source_cancel(_timer);            dispatch_async(dispatch_get_main_queue(), ^{               weakself.numberLabel.text = @"結束";            });        }else{            //            int minutes = timeout_int / 60;            int seconds = timeout_int % 61;            NSString *strTime = [NSString stringWithFormat:@"%.2d", seconds];           dispatch_async(dispatch_get_main_queue(), ^{                //設定介面的按鈕顯示                weakself.numberLabel.text = strTime;            });            timeout_int++;              }    });    dispatch_resume(_timer);}

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替代NSTimer的block計時器！！ !