我想在按下按钮后为 UIPickerView 制作动画。我已经将 UIPickerView 编码为隐藏在 viewDidLoad 上，并且在按下按钮后不会隐藏，但它的动画效果不像 ModalViewController 默认情况下的动画效果。我只希望我的 UIPickerView 能够像 ModalViewController 默认动画一样进行动画处理。
我已经在网站和网络上进行了研究，但我似乎无法正确完成。
这是我的代码：
#pragma mark - Picker View
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
return 1;
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
return 4;
}
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
timersArray = [[NSMutableArray alloc] init];
[timersArray addObject:@"No timer"];
[timersArray addObject:@"15 seconds"];
[timersArray addObject:@"30 seconds"];
[timersArray addObject:@"60 seconds"];
return [timersArray objectAtIndex:row];
}
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
if ([[timersArray objectAtIndex:row] isEqual:@"No timer"])
{
timerIndication.text = @"No timer selected";
timersPickerView.hidden = YES;
// Animation code to dismiss picker should go here
}
else if ([[timersArray objectAtIndex:row] isEqual:@"15 seconds"])
{
timerIndication.text = @"15 seconds selected";
timersPickerView.hidden = YES;
// Animation code to dismiss picker should go here
}
else if ([[timersArray objectAtIndex:row] isEqual:@"30 seconds"])
{
timerIndication.text = @"30 seconds selected";
timersPickerView.hidden = YES;
// Animation code to dismiss picker should go here
}
else if ([[timersArray objectAtIndex:row] isEqual:@"60 seconds"])
{
timerIndication.text = @"60 seconds selected";
timersPickerView.hidden = YES;
// Animation code to dismiss picker should go here
}
}
#pragma mark - Delay method
// This is where Send button should be enabled
- (IBAction)selectTimer
{
timersPickerView.hidden = NO;
// Animation code to present picker view should go here
}
您可以使用以下代码在按下按钮后为选取器视图设置动画：
-(IBAction)button:(id)sender
{
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.6];
CGAffineTransform transfrom = CGAffineTransformMakeTranslation(0, 200);
PickerView.transform = transfrom;
PickerView.alpha = PickerView.alpha * (-1) + 1;
[UIView commitAnimations];
}
不要忘记将以下代码添加到您的 viewDidLoad 方法中
PickerView.alpha = 0;
[self.view addSubview:PickerView];
它的作用是使选择器视图在第一次单击时从屏幕顶部掉落，并使选择器视图消失，您只需再次单击该按钮即可。从下一次单击开始，选择器视图就会出现并消失..希望它有帮助并且有效:)
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