带有文本字段的 iphone alertview答案

【问题标题】：iphone alertview with textfield带有文本字段的 iphone alertview
【发布时间】：2011-04-07 04:35:56
【问题描述】：

我有一个UIAlertView，里面有一个UITextField。我想在UIAlertView的ok按钮中输入mail id并提交，但是UIAlertView中的UITextField没有反应，请帮帮我。

谢谢

【问题讨论】：

标签： iphone objective-c cocoa-touch uialertview

【解决方案1】：

从 iOS 5 开始，不再需要上述方法。只需将alertViewStyle 属性设置为适当的样式（UIAlertViewStyleSecureTextInput、UIAlertViewStylePlainTextInput 或UIAlertViewStyleLoginAndPasswordInput）。

例子：

UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Email" message:@"Enter your email:" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Ok", nil];
alertView.alertViewStyle = UIAlertViewStylePlainTextInput;
[alertView show];

你可以得到回复

-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    UITextField *emailTextField = [alertView textFieldAtIndex:0];
    NSLog(@"%@",emailTextField.text);
}

【讨论】：

【解决方案2】：

UIAlertView 与UITextField：

用法：

NSString *title         = NSLocalizedString(@"Your Title","");
NSString *placeholder   = NSLocalizedString(@"Placeholder Text","");
NSString *message       = NSLocalizedString(@"A message to the user.","");
NSString *cancel        = NSLocalizedString(@"Cancel","");
NSString *okay          = NSLocalizedString(@"Continue","");

prompt = [[AlertPrompt alloc] initWithTitle:title 
                   placeholder:placeholder 
                       message:message 
                      delegate:self 
             cancelButtonTitle:cancel 
                 okButtonTitle:okay];
[prompt show];
[prompt release];

.h

#import <Foundation/Foundation.h>

@interface AlertPrompt : UIAlertView <UITextFieldDelegate>
{
    UITextField *textField;
    NSString *enteredText;
}
@property(nonatomic,retain) UITextField *textField;
@property (nonatomic, retain, readonly) NSString *enteredText;
- (id)initWithTitle:(NSString *)title placeholder:(NSString *)placeholder message:(NSString *)message delegate:(id)delegate 
  cancelButtonTitle:(NSString *)cancelButtonTitle okButtonTitle:(NSString *)okayButtonTitle;
@end

.m

#import ".h"

@implementation AlertPrompt

@synthesize textField;
@synthesize enteredText;

#pragma mark -
#pragma mark AlertPrompt Delegates

- (id)initWithTitle:(NSString *)title placeholder:(NSString *)placeholder message:(NSString *)message delegate:(id)delegate 
  cancelButtonTitle:(NSString *)cancelButtonTitle okButtonTitle:(NSString *)okayButtonTitle {

    if (self = [super initWithTitle:title message:message delegate:delegate cancelButtonTitle:cancelButtonTitle otherButtonTitles:okayButtonTitle, nil])
    {
        self.title      = title;
        self.message      = [NSString stringWithFormat:@"%@\n\n\n",message];
        self.delegate    = delegate;

        UITextField *theTextField = [[UITextField alloc] initWithFrame:CGRectMake(12.0, 75.0f, 260.0, 30.0)]; 
        [theTextField setBackgroundColor:[UIColor clearColor]]; 
        theTextField.borderStyle = UITextBorderStyleRoundedRect;
        theTextField.textColor = [UIColor blackColor];
        theTextField.font = [UIFont systemFontOfSize:18.0];
        theTextField.autocapitalizationType = UITextAutocapitalizationTypeWords;
        theTextField.keyboardAppearance = UIKeyboardAppearanceAlert;
        theTextField.returnKeyType = UIReturnKeyDone;
        theTextField.clearButtonMode = UITextFieldViewModeWhileEditing;
        theTextField.placeholder = placeholder;
        theTextField.delegate = self;
        [self insertSubview:theTextField atIndex:0];
        self.textField = theTextField;
        [theTextField release];
        CGAffineTransform translate = CGAffineTransformMakeTranslation(0, -10); 
        [self setTransform:translate];
    }
    return self;
}

- (void)show{
    [textField becomeFirstResponder];
    [super show];
}

- (NSString *)enteredText{
    return textField.text;
}

- (void)dealloc{
    [textField resignFirstResponder];
    [textField release];
    [super dealloc];
}
@end

代表：

-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex 
{
    if([alertView.title isEqualToString:@"Your Title"])
    {    
        if(buttonIndex == 1)
        {
            /*  get the user iputted text  */
            NSString *inputValue = [(AlertPrompt *)alertView enteredText];
            NSLog(@"User Input: %@",inputValue);
        {
    }
}

【讨论】：

这是一个非常解释性的答案+1
+1 但文本字段的使用不是私有的吗？或者至少没有证件？至少在 3.x 中。
@Jordan 不，这个例子没有任何“未记录”的地方。实际上，我在 iTunes App Store 中有 4 个应用程序使用了这段代码，并且在批准方面没有任何问题。
@WrightsCS - 我没有说它不起作用，或者它不会获得批准。只是它是无证的。这意味着行为可能会在未来发生变化。
@Jordan，不，没有潜在的行为改变。这都是标准的东西。这个例子中的什么看起来可能会改变？我的意思是，对于 Apple，您可能会有所改变，但您会顺势而为并更新您的代码。

【解决方案3】：

UIAlertView *emailAlert=[[UIAlertView alloc]initWithTitle:@"Enter your Email-id" message:@"\n\n" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"OK",nil];
    emailTextField=[[UITextField alloc]initWithFrame:CGRectMake(12,45,260,25)];
    [emailTextField becomeFirstResponder];

    [emailTextField setBackgroundColor:[UIColor whiteColor]];
    emailTextField.clearButtonMode=UITextFieldViewModeWhileEditing;
        emailTextField.placeHolder=@"Email";
    [emailAlert addSubview:emailTextField];
    [emailAlert show];
    [emailAlert release];

单击确定按钮时使用 UIAlertView 委托方法。

【讨论】：

【解决方案4】：

Swift 版本：

var alert = UIAlertView(title: "PostActionTitle", message: "PostActionText", delegate: self, cancelButtonTitle:"PostActionDecline")
alert.alertViewStyle = UIAlertViewStyle.PlainTextInput
alert.addButtonWithTitle("PostActionAccept")
alert.show()

【讨论】：