在按钮的点击事件里 加下面的代码
//先将未到时间执行前的任务取消。
[[self class
]
cancelPreviousPerformRequestsWithTarget:self selector:@selector
(
todoSomething:
)
object:
sender
];
[self performSelector:@selector(
todoSomething:
) withObject:sender afterDelay:0.2f];