为UIPicker设置延迟动画？

Question

如果我在下面有这个代码告诉UIPicker如果没有选择任何东西将脚设置为1，我怎么能延迟这个动作几秒钟？

// 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];

---

只要您想启动计时器，就可以放置上述代码。

-(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];


    }
}