Summary of common methods of UIAlertView (alert box) in IOS

One, initialization method

- (instancetype)initWithTitle:(NSString )title message:(NSString)message delegate:(id /<UIAlertViewDelegate>/)delegate cancelButtonTitle:(NSString )cancelButtonTitle otherButtonTitles:(NSString )otherButtonTitles, ...;

This method creates an alert box by setting a title, content, proxy, and some button titles. The code example is as follows:

1 2	`UIAlertView * alert = [[UIAlertView alloc]initWithTitle:@` `"我的警告框"` `message:@` `"这是一个警告框"` `delegate:self cancelButtonTitle:@` `"取消"` `otherButtonTitles:@` `"确定"` `, nil];` `[alert show];`

The effect is as follows:

Note: If there are more than two buttons, they will be created as follows:

If the number of buttons exceeds the screen display range, an effect similar to tableView will be created.

2. Attribute and method analysis

Title attribute

@property(nonatomic,copy) NSString *title;

Content attribute

@property(nonatomic,copy) NSString *message;

Add a button and return the index value of this button

- (NSInteger)addButtonWithTitle:(NSString *)title;

Returns the button title according to the button index

- (NSString *)buttonTitleAtIndex:(NSInteger)buttonIndex;

Get the number of buttons

@property(nonatomic,readonly) NSInteger numberOfButtons;

Set a button as a cancel button

@property(nonatomic) NSInteger cancelButtonIndex;

Returns the index value of the first button of other types

@property(nonatomic,readonly) NSInteger firstOtherButtonIndex;

Whether the warning box is visible

@property(nonatomic,readonly,getter=isVisible) BOOL visible;

显现警告框

- (void)show;

代码模拟点击按钮消失触发方法

- (void)dismissWithClickedButtonIndex:(NSInteger)buttonIndex animated:(BOOL)animated;

设置警告框风格

@property(nonatomic,assign) UIAlertViewStyle alertViewStyle;

风格的枚举如下

 
         typedef  
         NS_ENUM(NSInteger, UIAlertViewStyle) { 
        
         UIAlertViewStyleDefault = 0, 
         //默认风格 
        
         UIAlertViewStyleSecureTextInput, 
         //密码输入框风格 
        
         UIAlertViewStylePlainTextInput, 
         //普通输入框风格 
        
         UIAlertViewStyleLoginAndPasswordInput 
         //账号密码框风格 
        
         };

这个方法设置文本输入框的索引

- (UITextField *)textFieldAtIndex:(NSInteger)textFieldIndex;

三、UIAlertViewDelegate中的方法

点击按钮时触发的方法

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex;

将要展现警告框时触发的方法

- (void)willPresentAlertView:(UIAlertView *)alertView;

已经展现警告框时触发的方法

- (void)didPresentAlertView:(UIAlertView *)alertView;

警告框将要消失时触发的方法

- (void)alertView:(UIAlertView *)alertView willDismissWithButtonIndex:(NSInteger)buttonIndex;

警告框已经消失时触发的方法

- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex;

设置是否允许第一个按钮不是取消按钮

- (BOOL)alertViewShouldEnableFirstOtherButton:(UIAlertView *)alertView;