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當我將UIToolbar添加到視圖中時，出現「奇怪」的動畫故障。我將UIToolbar製作成動畫，使其從底部向上滑動，並與UIPickerView或UIDatePicker一起滑動。起初我看到它在滑動，但動畫完成後很快消失。這種情況發生在我滑下（動畫UIPickerView以滑下屏幕）並在此之後，我有另一個UIPickerView向上滑動。iOS - 使用UIToolbar動畫故障
我注意到，如果我在滑動呼叫上設置了延遲（- performSelector...）0.3秒，它將正確顯示UIToolbar（小於0.3秒的任何內容仍將具有相同的毛刺）。什麼可能導致這種情況？
編輯：也許我應該把兩者在新UIView容器UIToolbar和UIDatePicker？
這是我正在使用的代碼：
if ([self.view.subviews containsObject:self.dateRepeatPicker]) {
[self dismissDateRepeatPickerSegmentChanged:NO];
// "Hack", if I don't delay this call the UIToolbar will not display
[self performSelector:@selector(showDatePicker) withObject:nil afterDelay:0.3];
} else if (![self.view.subviews containsObject:self.datePicker]) {
[self showDatePicker];
}
- (void)dismissDateRepeatPickerSegmentChanged:(BOOL)segmentChanged {
CGRect toolbarTargetFrame = CGRectMake(0, self.view.bounds.size.height, 320, 44);
CGRect dateRepeatPickerTargetFrame = CGRectMake(0, self.view.bounds.size.height+44, 320, 216);
[UIView animateWithDuration:0.2
animations:^{
self.pickerToolbar.frame = toolbarTargetFrame;
self.dateRepeatPicker.frame = dateRepeatPickerTargetFrame;
}
completion:^(BOOL finished) {
if (segmentChanged) {
[self.pickerToolbar removeFromSuperview];
[self.dateRepeatPicker removeFromSuperview];
[self.remindMeTableView reloadData];
} else {
[self.pickerToolbar removeFromSuperview];
[self.dateRepeatPicker removeFromSuperview];
}
}];
}
- (void)showDatePicker {
// Create the Toolbar over the Picker
CGRect toolbarTargetFrame = CGRectMake(0, self.view.bounds.size.height-216-44, 320, 44);
if (self.pickerToolbar == nil) {
self.pickerToolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, self.view.bounds.size.height, 320, 44)];
self.pickerToolbar.barStyle = UIBarStyleBlack;
self.pickerToolbar.translucent = YES;
}
UIBarButtonItem *spacer = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"picker-dismiss.png"] style:UIBarButtonItemStyleBordered target:self action:@selector(dismissDatePickerToolbar)];
[self.pickerToolbar setItems:[NSArray arrayWithObjects:spacer, doneButton, nil]];
[self.view addSubview:self.pickerToolbar];
// Create the Picker under the Toolbar
CGRect datePickerTargetFrame = CGRectMake(0, self.view.bounds.size.height-216, 320, 216);
if (self.datePicker == nil) {
self.datePicker = [[UIDatePicker alloc] initWithFrame:CGRectMake(0, self.view.bounds.size.height+44, 320, 216)];
[self.datePicker setMinuteInterval:5];
[self.datePicker addTarget:self action:@selector(changeDate:) forControlEvents:UIControlEventValueChanged];
}
[self.view addSubview:self.datePicker];
[UIView animateWithDuration:0.2 animations:^{
self.pickerToolbar.frame = toolbarTargetFrame;
self.datePicker.frame = datePickerTargetFrame;
}];
}