如何在警报视图中提示用户输入文本

Posted 2023-03-12

【中文标题】如何在警报视图中提示用户输入文本

【英文标题】：How to prompt user for text input in Alert view

【发布时间】：2011-08-10 18:26:44

【问题描述】：

我正在编写一段代码，如果我可以使用类似 UIAlertView 的弹出框并提示用户输入密码等文本，那将是最好的选择。 关于这样做的优雅方式的任何指示？

【参考方案1】：

ios 5 中的事情要简单得多，只需将 alertViewStyle 属性设置为适当的样式（UIAlertViewStyleSecureTextInput、UIAlertViewStylePlainTextInput 或 UIAlertViewStyleLoginAndPasswordInput）。示例：

UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Password" message:@"Enter your password:" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Ok", nil];
alertView.alertViewStyle = UIAlertViewStyleSecureTextInput;
UITextField *passwordTextField = [alertView textFieldAtIndex:0];
[alertView show];

【参考方案2】：

>简单可以这样申请

UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Filename" message:@"Enter the file name:" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Ok", nil];
alertView.alertViewStyle = UIAlertViewStylePlainTextInput;
UITextField *passwordTextField = [alertView textFieldAtIndex:0];
[alertView show]

【参考方案3】：

我发现执行此操作的最佳方法是遵循本教程：http://junecloud.com/journal/code/displaying-a-password-or-text-entry-prompt-on-the-iphone.html

用于实现这一点的代码是（直接取自那个很棒的教程）：

UIAlertView *passwordAlert = [[UIAlertView alloc] initWithTitle:@"Server Password" message:@"\n\n\n"
delegate:self cancelButtonTitle:NSLocalizedString(@"Cancel",nil) otherButtonTitles:NSLocalizedString(@"OK",nil), nil];

UILabel *passwordLabel = [[UILabel alloc] initWithFrame:CGRectMake(12,40,260,25)];
passwordLabel.font = [UIFont systemFontOfSize:16];
passwordLabel.textColor = [UIColor whiteColor];
passwordLabel.backgroundColor = [UIColor clearColor];
passwordLabel.shadowColor = [UIColor blackColor];
passwordLabel.shadowOffset = CGSizeMake(0,-1);
passwordLabel.textAlignment = UITextAlignmentCenter;
passwordLabel.text = @"Account Name";
[passwordAlert addSubview:passwordLabel];

UIImageView *passwordImage = [[UIImageView alloc] initWithImage:[UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"passwordfield" ofType:@"png"]]];
passwordImage.frame = CGRectMake(11,79,262,31);
[passwordAlert addSubview:passwordImage];

UITextField *passwordField = [[UITextField alloc] initWithFrame:CGRectMake(16,83,252,25)];
passwordField.font = [UIFont systemFontOfSize:18];
passwordField.backgroundColor = [UIColor whiteColor];
passwordField.secureTextEntry = YES;
passwordField.keyboardAppearance = UIKeyboardAppearanceAlert;
passwordField.delegate = self;
[passwordField becomeFirstResponder];
[passwordAlert addSubview:passwordField];

[passwordAlert setTransform:CGAffineTransformMakeTranslation(0,109)];
[passwordAlert show];
[passwordAlert release];
[passwordField release];
[passwordImage release];
[passwordLabel release];

【讨论】：

移除图像、字体和背景颜色分配。添加密码Field.borderStyle = UITextBorderStyleRoundedRect;

[passwordAlert setTransform:CGAffineTransformMakeTranslation(0,109)];已经过时了。

很高兴知道可以做到这一点，但 xcoder 的答案对于 iOS 5 及更高版本要好得多...

【参考方案4】：

如果我的应用还没有发布一两个月，那么我会登录http://developer.apple.com，查看 iOS 5 测试版区域，看看UIAlertView 是否有什么东西可以为我们准备。

【参考方案5】：

我认为知道 UIAlertView 不是模态的，因此警报不会阻塞会很有帮助。

我遇到了这个问题，我想提示用户输入然后继续，然后在代码中使用该输入。但是，[alert show] 之后的代码将首先运行，直到您到达运行循环的末尾，然后才会显示警报。

【参考方案6】：

优化代码：

UIAlertView *passwordAlert = [[UIAlertView alloc] initWithTitle:@"Password"
                                                        message:@"Please enter the password:\n\n\n"
                                                       delegate:self
                                              cancelButtonTitle:NSLocalizedString(@"Cancel",nil)
                                              otherButtonTitles:NSLocalizedString(@"OK",nil), nil];

UITextField *passwordField = [[UITextField alloc] initWithFrame:CGRectMake(16,83,252,25)];
passwordField.borderStyle = UITextBorderStyleRoundedRect;
passwordField.secureTextEntry = YES;
passwordField.keyboardAppearance = UIKeyboardAppearanceAlert;
passwordField.delegate = self;
[passwordField becomeFirstResponder];
[passwordAlert addSubview:passwordField];

[passwordAlert show];
[passwordAlert release];
[passwordField release];