【iOS】点击UIButton,弹出UIPickerView

最新推荐文章于 2019-08-19 17:40:30 发布

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最新推荐文章于 2019-08-19 17:40:30 发布

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分类专栏： iOS 文章标签： ios7 Object-C iOS UIPickerView

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本文介绍了如何在iOS应用中实现点击UIButton后弹出UIPickerView。通过创建一个隐藏的UITextField，监听UIButton事件，设置bar buttons及实现UIPickerView代理方法来完成交互。

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不需要讲UIPickerView 作为 subview :

做一个隐藏的 UITextField

ViewController.m

 
  #import "ViewController.h"

@interface ViewController ()

@property (nonatomic, strong) UITextField *pickerViewTextField;

@end

@implementation ViewController

@synthesize pickerViewTextField = _pickerViewTextField;

- (void)viewDidLoad
{
    [super viewDidLoad];

    // set the frame to zero
    self.pickerViewTextField = [[UITextField alloc] initWithFrame:CGRectZero];
    [self.view addSubview:self.pickerViewTextField];

    UIPickerView *pickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(0, 0, 0, 0)];
    pickerView.showsSelectionIndicator = YES;
    pickerView.dataSource = self;
    pickerView.delegate = self;

    // set change the inputView (default is keyboard) to UIPickerView
    self.pickerViewTextField.inputView = pickerView;

    // add a toolbar with Cancel & Done button
    UIToolbar *toolBar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];
    toolBar.barStyle = UIBarStyleBlackOpaque;

    UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(doneTouched:)];
    UIBarButtonItem *cancelButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:@selector(cancelTouched:)];

    // the middle button is to make the Done button align to right
    [toolBar setItems:[NSArray arrayWithObjects:cancelButton, [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil], doneButton, nil]];
    self.pickerViewTextField.inputAccessoryView = toolBar;

    ...
}
 
 

监听 UIButton

ViewController.m

 
  ...
- (IBAction)someButtonTouched:(UIButton *)sender
{
    [self.pickerViewTextField becomeFirstResponder];
}
 
 

添加 bar buttons 方法

ViewController.m

 
  - (void)cancelTouched:(UIBarButtonItem *)sender
{
    // hide the picker view
    [self.pickerViewTextField resignFirstResponder];
}

- (void)doneTouched:(UIBarButtonItem *)sender
{
    // hide the picker view
    [self.pickerViewTextField resignFirstResponder];

    // perform some action
}
 
 

添加代理 UIPickerView

ViewController.m

 
  #pragma mark - UIPickerViewDataSource
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    return 1;
}

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
    return [yourItems count];
}

#pragma mark - UIPickerViewDelegate
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
    NSString *item = [yourItems objectAtIndex:row];

    return item;
}

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    // perform some action
}
 
 

ViewController.h

 
  @interface ViewController : UIViewController <UIPickerViewDataSource, UIPickerViewDelegate> 
 