Question

所以我在这里找到了这个惊人的代码，弹出一个UIDatePicker。（对Matthias Bauch的称赞）我想用自定义选择器轮定制它，但是代码处于复杂程度，我不知道如何切换到UIPicker以及如何用我的数组填充所述选择器。

以下是原始代码：

- (void)changeDate:(UIDatePicker *)sender {
    NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
  [dateFormat setDateFormat:@"cccc, MMM d, hh:mm aa"];
  NSString *formattedVersion = [dateFormat stringFromDate:sender.date];
  NSLog(@"%@",formattedVersion);

}

- (void)removeViews:(id)object {
 [[self.view viewWithTag:9] removeFromSuperview];
 [[self.view viewWithTag:10] removeFromSuperview];
 [[self.view viewWithTag:11] removeFromSuperview];
}

- (void)dismissDatePicker:(id)sender {
 CGRect toolbarTargetFrame = CGRectMake(0, self.view.bounds.size.height, 320, 44);
 CGRect datePickerTargetFrame = CGRectMake(0, self.view.bounds.size.height+44, 320, 216);
 [UIView beginAnimations:@"MoveOut" context:nil];
 [self.view viewWithTag:9].alpha = 0;
 [self.view viewWithTag:10].frame = datePickerTargetFrame;
 [self.view viewWithTag:11].frame = toolbarTargetFrame;
 [UIView setAnimationDelegate:self];
 [UIView setAnimationDidStopSelector:@selector(removeViews:)];
 [UIView commitAnimations];
}

- (IBAction)callDP:(id)sender {
 if ([self.view viewWithTag:9]) {
  return;
 }
 CGRect toolbarTargetFrame = CGRectMake(0, self.view.bounds.size.height-216-44, 320, 44);
 CGRect datePickerTargetFrame = CGRectMake(0, self.view.bounds.size.height-216, 320, 216);

 UIView *darkView = [[[UIView alloc] initWithFrame:self.view.bounds] autorelease];
 darkView.alpha = 0;
 darkView.backgroundColor = [UIColor blackColor];
 darkView.tag = 9;
 UITapGestureRecognizer *tapGesture = [[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(dismissDatePicker:)] autorelease];
 [darkView addGestureRecognizer:tapGesture];
 [self.view addSubview:darkView];

 UIDatePicker *datePicker = [[[UIDatePicker alloc] initWithFrame:CGRectMake(0, self.view.bounds.size.height+44, 320, 216)] autorelease];
 datePicker.tag = 10;
 [datePicker addTarget:self action:@selector(changeDate:) forControlEvents:UIControlEventValueChanged];
 [self.view addSubview:datePicker];

 UIToolbar *toolBar = [[[UIToolbar alloc] initWithFrame:CGRectMake(0, self.view.bounds.size.height, 320, 44)] autorelease];
 toolBar.tag = 11;
 toolBar.barStyle = UIBarStyleBlackTranslucent;
 UIBarButtonItem *spacer = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil] autorelease];
 UIBarButtonItem *doneButton = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(dismissDatePicker:)] autorelease];
 [toolBar setItems:[NSArray arrayWithObjects:spacer, doneButton, nil]];
 [self.view addSubview:toolBar];

 [UIView beginAnimations:@"MoveIn" context:nil];
 toolBar.frame = toolbarTargetFrame;
 datePicker.frame = datePickerTargetFrame;
 darkView.alpha = 0.5;
 [UIView commitAnimations];
}

我想在选择器轮中添加带有这些值的UIPicker：

  Days=[[NSArray alloc] initWithObjects: @"Today", @"Tomorrow", nil];
  Hours = [[NSArray alloc] initWithObjects:@"1", @"2", @"3", @"4", @"5", @"6", @"7", @"8", @"9", @"10", @"11", @"12", nil];
  Minutes=[[NSArray alloc] initWithObjects:@"05", @"10", @"15", @"20", @"25", @"30", @"35", @"40", @"45", @"50", @"55", nil];

非常感谢任何帮助/指导!!

谢谢，垫

Answer 1

您需要使用UIPickerView代替UIDatePicker。然后，您需要提供适当的委托方法来为其提供数据。

首先创建一个数组来保存选择器中可用的项目：

NSMutableArray *arrayColors = [[NSMutableArray alloc] init];
[arrayColors addObject:@"Red"];
[arrayColors addObject:@"Orange"];

为选择器实现数据源方法：

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)thePickerView {
    return 1;
}

- (NSInteger)pickerView:(UIPickerView *)thePickerView numberOfRowsInComponent:(NSInteger)component {

return [arrayColors count];
}

- (NSString *)pickerView:(UIPickerView *)thePickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
return [arrayColors objectAtIndex:row];
}

用于获取用户选择的项目的委托方法：

- (void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {

NSLog(@"Selected Color: %@. Index of selected color: %i", [arrayColors objectAtIndex:row], row);
}

这是documentation。

<强>更新

以编程方式创建UIPickerView，确保它看起来像这样：

//Make sure our class knows we have picker delegate/data source methods in it
@interface myViewController : UIViewController <UIPickerViewDataSource, UIPickerViewDelegate>

创作

//Picker creation
UIPickerView *myPickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(0, 200, 320, 200)];
myPickerView.delegate = self;
myPickerView.showsSelectionIndicator = YES;
[self.view addSubview:myPickerView];

一个方便的委托方法

// tell the picker the width of each row for a given component. no necessary but helpful if need be
- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component {
 int sectionWidth = 300;

 return sectionWidth;
}

Answer 2

添加随机评论。如果您想在使用UITextField输入信息到文本字段时使用此选择器来替换键盘，请按照以下方式进行操作。

[<Your UI text field> setInputView:<your picker view>];

示例：

NSMutableArray *pickerData = [[NSMutableArray alloc]initWithObjects:@"",@"1", @"2", @"3", @"4", @"5", @"6", @"7", nil];
UIPickerView *myPickerView = [[UIPickerView alloc]init];
myPickerView.delegate = self;
myPickerView.dataSource = self;
myPickerView.showsSelectionIndicator = YES;
[self.myTexfield setInputView:myPickerView];

调整自定义UIDatePicker的代码

2 个答案: