链接地址:http://www.cnblogs.com/scandy-yuan/archive/2013/03/11/2954194.html
1. 最简单的用法
UIAlertView*alert = [[UIAlertView alloc]initWithTitle:@"提示" message:@"这是一个简单的警告框!" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil]; [alert show];
2. 为UIAlertView添加多个按钮
UIAlertView*alert = [[UIAlertView alloc]initWithTitle:@"提示" message:@"请选择一个按钮:" delegate:nil cancelButtonTitle:@"取消" otherButtonTitles:@"按钮一",
@"按钮二",
@"按钮三", nil]
[alert show];
3. 如何判断用户点击的按钮
UIAlertView有一个委托UIAlertViewDelegate ,继承该委托来实现点击事件
头文件: @interface MyAlertViewViewController : UIViewController<UIAlertViewDelegate> { } - (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex; -(IBAction) buttonPressed; @end 源文件: -(IBAction) buttonPressed { UIAlertView*alert = [[UIAlertView alloc]initWithTitle:@"提示" message:@"请选择一个按钮:" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"按钮一", @"按钮二", @"按钮三",nil]; [alert show]; } - (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex { NSString* msg = [[NSString alloc] initWithFormat:@"您按下的第%d个按钮!",buttonIndex]; UIAlertView* alert = [[UIAlertView alloc]initWithTitle:@"提示" message:msg delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil]; [alert show]; }
点击“取消”,“按钮一”,“按钮二”,“按钮三”的索引buttonIndex分别是0,1,2,3
4.修改提示框样式
iOS5中UIAlertView新增了一个属性alertViewStyle,它的类型是UIAlertViewStyle,是一个枚举值:
typedef enum {
UIAlertViewStyleDefault = 0,
UIAlertViewStyleSecureTextInput,
UIAlertViewStylePlainTextInput,
UIAlertViewStyleLoginAndPasswordInput
} UIAlertViewStyle;
alertViewStyle属性默认是UIAlertViewStyleDefault。我们可以把它设置为UIAlertViewStylePlainTextInput,那么AlertView就显示为这样:
UIAlertViewStyleSecureTextInput显示为:
UIAlertViewStyleLoginAndPasswordInput为:
当然我们也可以通过创建
UITextField来关联这里的输入框并设置键盘响应的样式
UIAlertView * alert = [[UIAlertView alloc]initWithTitle:@"CD-KEY" message:@"please enter cd-key:" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Ok",nil];
[alert setAlertViewStyle:UIAlertViewStyleLoginAndPasswordInput]; UITextField * text1 = [alert textFieldAtIndex:0]; UITextField * text2 = [alert textFieldAtIndex:1]; text1.keyboardType = UIKeyboardTypeNumberPad; text2.keyboardType = UIKeyboardTypeNumbersAndPunctuation; [alert show];
UIAlertViewStyleSecureTextInput和UIAlertViewStylePlainTextInput可以通过textFieldIndex为0来获取输入框对象。
UIAlertViewStyleLoginAndPasswordInput可以通过textFieldIndex为0和1分别获取用户名输入框对象和密码输入框对象。