【移动开发】警告视图_UIAlertView

警告视图和操作表单的创建方式非常类似。

UIAlertView *alert = [[UIAlertView alloc]
                              initWithTitle:@"Something was done"
                              message:msg
                              delegate:nil
                              cancelButtonTitle:@"Phew!"
                              otherButtonTitles:nil];
        [alert show];

这里delegate参数传如的nil，表明不需要与UIAlertView进行交互。如果想要交互，那么需要传入一个实现了UIAlertViewDelegate协议的对象。

@protocol UIAlertViewDelegate <NSObject>
@optional

// Called when a button is clicked. The view will be automatically dismissed after this call returns
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex;

// Called when we cancel a view (eg. the user clicks the Home button). This is not called when the user clicks the cancel button.
// If not defined in the delegate, we simulate a click in the cancel button
- (void)alertViewCancel:(UIAlertView *)alertView;

- (void)willPresentAlertView:(UIAlertView *)alertView;  // before animation and showing view
- (void)didPresentAlertView:(UIAlertView *)alertView;  // after animation

- (void)alertView:(UIAlertView *)alertView willDismissWithButtonIndex:(NSInteger)buttonIndex; // before animation and hiding view
- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex;  // after animation

// Called after edits in any of the default fields added by the style
- (BOOL)alertViewShouldEnableFirstOtherButton:(UIAlertView *)alertView;

@end

参考资料

https://developer.apple.com/library/IOS/documentation/UserExperience/Conceptual/UIKitUICatalog/UIAlertView.html#//apple_ref/doc/uid/TP40012857-UIAlertView-SW1

https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIAlertViewDelegate_Protocol/

https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIAlertView_Class/