如何在“警报”视图中提示用户输入文本

Question

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。 有关优雅方式的任何指示吗？

Answer 1

在iOS 5中，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）。例如：

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];

Answer 2

＆GT;简单你可以像这样申请

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]

Answer 3

我发现这样做的最好方法是遵循本教程：http://junecloud.com/journal/code/displaying-a-password-or-text-entry-prompt-on-the-iphone.html

用于实现此目的的代码（直接来自那个伟大的教程）：

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];

Answer 4

如果我的应用程序尚未发布一两个月，那么我将登录http://developer.apple.com，查看iOS 5测试版区域，看看UIAlertView是否可能存在某些内容对我们来说。

Answer 5

我认为知道UIAlertView不是模态的会有所帮助，因此警报不会阻止。

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结束，然后将显示警报。

Answer 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];