为UIPicker设置延迟动画？

Question

如果我有下面这段代码告诉UIPicker如果没有选择任何东西来将脚设置为1，我该如何延迟这个动作几秒？

// If feet values are zero. 
if (([feetPicker selectedRowInComponent:0] == 0 & [feetPicker selectedRowInComponent:1] == 0)){ 
// Set to one foot. 
[feetPicker selectRow:1 
      inComponent:1 
      animated:YES]; 


} 

Answer 1

[NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:@selector(fireMethod) userInfo:nil repeats:NO]; 

---

上面的代码可以，只要你想启动定时器放置。

-(void)fireMethod { 
    // If feet values are zero. 
if (([feetPicker selectedRowInComponent:0] == 0 & [feetPicker selectedRowInComponent:1] == 0)){ 
// Set to one foot. 
[feetPicker selectRow:1 
      inComponent:1 
      animated:YES]; 


    } 
}