UIPickerview 完成按钮不起作用，即使它没有调用选择器方法

Posted 2023-02-24

【中文标题】UIPickerview 完成按钮不起作用，即使它没有调用选择器方法

【英文标题】：UIPickerview done button not working, even its not calling selector method

【发布时间】：2016-01-29 10:00:43

【问题描述】：

我正在创建UIPickerViewprogramatically并添加了一个自定义button，当用户按下button时，picker将不会显示。但是当我按下button时，它甚至没有调用它的selectormethod。我知道这个问题在这个网站上有很多答案，但它并没有解决我的问题。

-(void) funtion

self.myPickerView = [[UIPickerView alloc]init];
self.myPickerView.dataSource = self;
self.myPickerView.delegate = self;
self.myPickerView.showsSelectionIndicator = YES;
self.myPickerView.frame = CGRectMake(0, 417, 320, 151);
[self.myPickerView setBackgroundColor:[UIColor whiteColor]];

UIToolbar *toolBar= [[UIToolbar alloc] initWithFrame:CGRectMake(0,0,320,44)];
[toolBar setBarStyle:UIBarStyleBlackOpaque];
UIBarButtonItem *barButtonDone = [[UIBarButtonItem alloc] initWithTitle:@"Done"
                                                                  style:UIBarButtonItemStyleBordered
                                                                 target:self
                                                                 action:@selector(donePressed:)];
toolBar.items = [[NSArray alloc] initWithObjects:barButtonDone,nil];
barButtonDone.tintColor=[UIColor blackColor];


[self.myPickerView addSubview:toolBar];

[self.view addSubview:self.myPickerView];



-(void)donePressed:(id)sender

      [self.myPickerView endEditing:YES];

【问题讨论】：

你在哪里调用这个方法函数

@Anbu.Karthik 它在 viewdidload 中

您将此选择器视图用于文本字段或其他地方的位置

我在一个按钮上使用它，当我按下那个按钮时，会显示pickerview

【参考方案1】：

例如我添加这个

第一步

创建一个 UIPicker,UItextField 和 NSArray 以加载详细信息

@interface ViewController ()<UITextFieldDelegate,UIPickerViewDataSource,UIPickerViewDelegate>


UITextField *myTextField;
UIPickerView *myPickerView;
NSArray *pickerArray;


@end

第二步

在您的ViewDidLoad 上调用选择器方法，如

- (void)viewDidLoad 
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[self addPickerView];

第三步

create the picker, textfield and done button

-(void)addPickerView
pickerArray = [[NSArray alloc]initWithObjects:@"Chess",
               @"Cricket",@"Football",@"Tennis",@"Volleyball", nil];
myTextField = [[UITextField alloc]initWithFrame:
               CGRectMake(10, 100, 300, 30)];
myTextField.borderStyle = UITextBorderStyleRoundedRect;
myTextField.textAlignment = NSTextAlignmentCenter;
myTextField.delegate = self;
[self.view addSubview:myTextField];
[myTextField setPlaceholder:@"Pick a Sport"];
myPickerView = [[UIPickerView alloc]init];
myPickerView.dataSource = self;
myPickerView.delegate = self;
myPickerView.showsSelectionIndicator = YES;
UIBarButtonItem *doneButton = [[UIBarButtonItem alloc]
                               initWithTitle:@"Done" style:UIBarButtonItemStyleDone
                               target:self action:@selector(done:)];
UIToolbar *toolBar = [[UIToolbar alloc]initWithFrame:
                      CGRectMake(0, self.view.frame.size.height-
                                 myPickerView.frame.size.height-50, 320, 50)];
[toolBar setBarStyle:UIBarStyleBlackOpaque];
NSArray *toolbarItems = [NSArray arrayWithObjects:
                         doneButton, nil];
[toolBar setItems:toolbarItems];
myTextField.inputView = myPickerView;
myTextField.inputAccessoryView = toolBar;

第四步

如果用户按下完成按钮退出选择器

-(void)done:(id)sender


[myTextField resignFirstResponder];

第五步

PickerView 委托方法

#pragma mark - Picker View Data source
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
return 1;

-(NSInteger)pickerView:(UIPickerView *)pickerView
numberOfRowsInComponent:(NSInteger)component
return [pickerArray count];


#pragma mark- Picker View Delegate

-(void)pickerView:(UIPickerView *)pickerView didSelectRow:
(NSInteger)row inComponent:(NSInteger)component
[myTextField setText:[pickerArray objectAtIndex:row]];

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:
(NSInteger)row forComponent:(NSInteger)component
return [pickerArray objectAtIndex:row];

这里我附上了sample project

样例输出

更新

如果你使用隐藏pickerview的按钮使用这个

-(void)donePressed:(id)sender

  [self.myPickerView removeFromSuperview];

当你按下按钮时调用这个方法

[self funtion];

【讨论】：

我面临的问题是工具栏放置在pickerview后面，这就是它没有检测到触摸事件的原因。你的解决方案帮助了我。谢谢

这里的关键是将选择器设置为inputView，将工具栏设置为inputAccessoryView。不要将工具栏设置为选取器的子视图。

按下完成后，[myPickerView removeFromSuperview] 无法正常工作。我尝试了[self.view endEditing:YES]，现在可以了！

【参考方案2】：

像这样添加完成按钮：-

UIButton *doneButton = [UIButton buttonWithType:UIButtonTypeCustom];
doneButton.frame = CGRectMake(0, 0, 40, 50);
[doneButton addTarget:self action:@selector(donePressed:) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *barButtonDone = [[UIBarButtonItem alloc] initWithCustomView:logoButton];
toolBar.items = [[NSArray alloc] initWithObjects:barButtonDone,nil];
barButtonDone.tintColor=[UIColor blackColor];
[self.myPickerView addSubview:toolBar];

【参考方案3】：

将工具栏作为 inputAccessoryView 添加到文本字段，

// Tool bar

UIToolbar *pickerToolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width,35)];
pickerToolbar.barStyle = UIBarStyleDefault;

// Bar button

UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(pickerDoneButtonTapped:)];
UIBarButtonItem *flexSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];

[pickerToolbar setItems:@[flexSpace,doneButton]];

self.selectedLockerTextFiled.inputAccessoryView = pickerToolbar;
self.selectedLockerTextFiled.inputView = picker;