UITextField 触摸事件在 UIScrollView 中不起作用答案

【问题标题】：UITextField touch events don`t work in UIScrollViewUITextField 触摸事件在 UIScrollView 中不起作用
【发布时间】：2015-07-17 08:21:26
【问题描述】：

我有一个 UITextField，当 UITextField 是 UIScrollView 的子视图时，文本字段操作不起作用。

其他方面，它工作正常，这是我的代码.. 请帮忙？

我正在使用此代码，因为我需要在单击 alertview 按钮后立即触发 UIDatePicker。

- (void)viewDidLoad {
[super viewDidLoad];


UIScrollView *scroll = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, 320, 480)];

[self.view addSubview:scroll];

date = [[UITextField alloc]initWithFrame:CGRectMake(80, 150, 150, 50)];
date.placeholder = @"Date";
date.delegate = self;
[date addTarget:self action:@selector(dateClicked:) forControlEvents:UIControlEventTouchDown];
[scroll addSubview:date];
 }

  - (void)dateClicked:(id)sender
    {
    NSLog(@"CLICKED");
     UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"Choose Date Format" message:nil delegate:self cancelButtonTitle:@"dd/MM/YYYY" otherButtonTitles:@"MM/dd/YYYY", nil];
     [alertView show];
      }

【问题讨论】：

使用 UIControlEventEditingDidBegin 代替 UIControlEventTouchUpInside
它的工作，但我想在更新文本字段文本的 alertView Button CLick 上打开一个 uipicker，如果我使用 UIControlEventEditingDidBegin 然后在更新文本后，alertview 将再次打开@Saurabh

标签： ios objective-c iphone uiscrollview uialertview

【解决方案1】：

设置UIButton相同的帧UITextField并设置UIButton 987654324 @事件和更新UITextField值。 P>

- (void)viewDidLoad {
    [super viewDidLoad];
UIScrollView *scroll = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, 320, 480)];

    [self.view addSubview:scroll];

    date = [[UITextField alloc]initWithFrame:CGRectMake(80, 150, 150, 50)];
    date.placeholder = @"Date";
    UIButton *btn=[[UIButton alloc]initWithFrame:CGRectMake(80, 150, 150, 50)];
    [btn addTarget:self action:@selector(dateClicked:) forControlEvents:UIControlEventTouchUpInside];
    [scroll addSubview:date];
    [scroll addSubview:btn];
}
- (void)dateClicked:(id)sender
{
    NSLog(@"CLICKED");
    UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"Choose Date Format" message:nil delegate:self cancelButtonTitle:@"dd/MM/YYYY" otherButtonTitles:@"MM/dd/YYYY", nil];
    [alertView show];
}

【讨论】：

它的工作，但我想在更新文本字段文本的 alertView Button CLick 上打开一个 uipicker，如果我使用 UIControlEventEditingDidBegin 然后在更新文本后，alertview 将再次打开@Dharmesh

【解决方案2】：

我根据您的要求创建了简单的示例，请看：

在.h文件中

 UITextField *date;
 NSMutableArray *arrData;

在 .m 文件中

- (void)viewDidLoad
{
    [super viewDidLoad];
    UIScrollView *scroll = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, 320, 480)];

    [self.view addSubview:scroll];

    date = [[UITextField alloc]initWithFrame:CGRectMake(80, 150, 150, 50)];
    date.placeholder = @"Date";
    date.delegate = self;
    [date addTarget:self action:@selector(dateClicked:) forControlEvents:UIControlEventEditingDidBegin];
    [scroll addSubview:date];

    arrData = [NSMutableArray array];
    for(int i=0;i<10;i++)
    {
         [arrData addObject:[NSString stringWithFormat:@"Object - %d",i]]
    }
}

- (void)dateClicked:(id)sender
{
    NSLog(@"CLICKED");
    UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"Choose Date Format" message:nil delegate:self cancelButtonTitle:@"dd/MM/YYYY" otherButtonTitles:@"MM/dd/YYYY", nil];
    [alertView show];
}

-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    UIPickerView *picker = [[UIPickerView alloc]initWithFrame:CGRectMake(80, 200, 150, 150)];
    picker.delegate = self;
    picker.dataSource = self;
    [self.view addSubview:picker];
}
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    return 1;
}
-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
    return 5;
}
-(NSString*)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
    return arrData[row];
}
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row      inComponent:(NSInteger)component
{
    date.text = arrData[row];
    [pickerView removeFromSuperview];
}

【讨论】：