IOS development: UIAlertView using

 

UIAlertView what is not introduced

 

1. Basic usage

 

  

   

1 UIAlertView *view = [[UIAlertView alloc]initWithTitle:@"Test"    //标题 
2                                               message:@"this is a alert view "   //显示内容 
3                                              delegate:nil          //委托，可以点击事件进行处理 
4                                     cancelButtonTitle:@"取消" 
5                                     otherButtonTitles:@"确定" 
6                                                     //,@"其他",    //添加其他按钮   
7 　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　 nil]; 
8 [view show];

  

 

 

renderings:

 

 

2. multiple buttons

 

cancel the above code @ "other" notes, run the effect is as follows

 

 

be so, add multiple

 

3. some system style parameters

 

UIAlertViewStyle This enumeration provides several styles

 

  

1 typedef NS_ENUM(NSInteger, UIAlertViewStyle) { 
2     UIAlertViewStyleDefault = 0,　　　　　　　　　　  //缺省样式 
3     UIAlertViewStyleSecureTextInput,　　　　　　　　 //密文输入框 
4     UIAlertViewStylePlainTextInput,　　　　　　　　  //明文输入框 
5     UIAlertViewStyleLoginAndPasswordInput　　　　　 //登录用输入框，有明文用户名，和密文密码输入二个输入框 
6 };

 

 

 

using the code below:

 

  

1     UIAlertView *view = [[UIAlertView alloc]initWithTitle:@"请等待"    //标题 
2                                                   message:@"this is a alert view "   //显示内容 
3                                                  delegate:nil                //委托，可以点击事件进行处理 
4                                         cancelButtonTitle:@"取消" 
5                                         otherButtonTitles:@"确定", 
6                                                     //,@"其他",    //添加其他按钮 
7                          nil]; 
8 [view setAlertViewStyle:UIAlertViewStyleLoginAndPasswordInput];   //控制样式

 

 

renderings:

 

 

this parameter is: UIAlertViewStyleLoginAndPasswordInput renderings, other self-view

 

But these types, I personally feel ugly and unacceptable, then customize a pop-up box, used to accept input

 

 

 

is not difficult to achieve, a friend in need can contact me

 

4. determine which button the user point

 

UIAlertView delegate UIAlertViewDelegate, implement the delegate to achieve click event, as follows:

 

. h file

 

  

1 @interface ViewController : UIViewController<UIAlertViewDelegate> { 
2  
3 }

 

 

 

in. m implement delegate methods

 

  

1 - (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex 
2 { 
3     NSString* msg = [[NSString alloc] initWithFormat:@"您按下的第%d个按钮！",buttonIndex]; 
4     NSLog(@"%@",msg); 
5 }

 

 

parameters in this method buttonIndex, represents the index of the button, the figure of the three buttons "Cancel", "OK", "Other" corresponds to the index are "0", "1" , "2".

 

manner with Delegate click, will bring a more troublesome problem, such as a page, there are several UIAlertView when handling click it, it will increase the complexity of processing logic, have to make some judgments < / p>  

this situation there is a solution, is to use Block, Block added a callback instead Delegate, target and selector . (next Expand write this content )

 

5. adding subviews

 

This use was also more and more, posted a few use cases

 

add UIActivityIndicatorView

 

 

 

implementation code:

 

  

 1     UIAlertView *view = [[UIAlertView alloc]initWithTitle:@"请等待" 
 2                                                   message:nil 
 3                                                  delegate:nil                 
 4                                         cancelButtonTitle:nil 
 5                                         otherButtonTitles:nil, 
 6                                                           nil]; 
 7      
 8     UIActivityIndicatorView *activeView = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge]; 
 9     activeView.center = CGPointMake(view.bounds.size.width/2.0f, view.bounds.size.height-40.0f); 
10     [activeView startAnimating]; 
11     [view addSubview:activeView]; 
12      
13     [view show];

 

 

 

add UITableView

 

 

this list a few lines of code do not know, say, the next idea, right, UIAlertView reason why there is so much space display UITableView, with a relatively tricky one way

 

  

1 UIAlertView *view = [[UIAlertView alloc]initWithTitle:@"请选择" 
2                                             message:@"\n\n\n\n\n\n\n\n\n\n" 
3                                                 delegate:nil                 
4                                        cancelButtonTitle:nil       
5                                                  otherButtonTitles:nil, 
6                                                            nil];           
7  //其中用了10个换行符来撑大UIAlertView的

 

 

then come back to add UITableView, can be self-fulfilling, if there is a need, please leave a message

 

Basically, this is some of the more common and useful things, then there is one more important thing is customize and beautify UIAlertView , I believe that many people care about this, customize and beautify the contents on the next one to go into detail, analyze several individuals feel good Demo source