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如果我開始這樣一個NSTimer:NSTimer是否貫穿整個應用程序?
@property (strong) NSTimer * messageTimer;
self.messageTimer = [NSTimer scheduledTimerWithTimeInterval:10.0
target:self
selector:@selector(checkForMessages)
userInfo:nil
repeats:YES];
是否繼續當我切換到不同的視圖控制器運行?
直到我取消:
[messageTimer invalidate]; self. messageTimer = nil;