NSTimer *timer = [[[NSTimer alloc]init]autorelease];
timer = [NSTimer scheduledTimerWithTimeInterval:3.0 target:self selector:@selector(function:) userInfo:nil repeats:YES];
timer = [NSTimer scheduledTimerWithTimeInterval:3.0 target:self selector:@selector(function:) userInfo:nil repeats:YES];
使用NSTimer定时执行任务
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