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如果我开始这样一个NSTimer:NSTimer是否贯穿整个应用程序?
@property (strong) NSTimer * messageTimer;
self.messageTimer = [NSTimer scheduledTimerWithTimeInterval:10.0
target:self
selector:@selector(checkForMessages)
userInfo:nil
repeats:YES];
是否继续当我切换到不同的视图控制器运行?
直到我取消:
[messageTimer invalidate]; self. messageTimer = nil;