iOS界面编程－UIAlertView

一、介绍

UIAlertView这个视图控件在iOS8以后不再使用转而使用UIAlertController，UIAlertView主要用给用户显示警告信息，提示用户注意。UIAlertView跟action sheet类似，主要在外表上有所区别。

二、相关属性及方法

初始化alert view

- (instancetype nonnull)initWithTitle:(NSString * nullable)title
                              message:(NSString * nullable)message
                             delegate:(id nullable)delegate
                    cancelButtonTitle:(NSString * nullable)cancelButtonTitle
                    otherButtonTitles:(NSString * nullable)otherButtonTitles,

@property(nonatomic,weak)iddelegate

@property(nonatomic,copy)NSString *title

@property(nonatomic,copy)NSString *message;  

增加一个按钮和其文字，并返回其增加的序列，按钮按照其增加的先后进行排序，按钮不能被自定义。

- (NSInteger)addButtonWithTitle:(NSString *)title;   // returns index of button. 0 based.

- (NSString *)buttonTitleAtIndex:(NSInteger)buttonIndex; 返回某个序列中按钮的文字。

@property(nonatomic,readonly)NSInteger numberOfButtons; 返回按钮的个数。

@property(nonatomic)NSInteger cancelButtonIndex;     // if the delegate does not implement -alertViewCancel:, we pretend this button was clicked on. default is -1

@property(nonatomic,readonly)NSInteger firstOtherButtonIndex;// -1 if no otherButtonTitles or initWithTitle:... not used

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

- (void)show;

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

// alert显示给用户的类型，iOS5以后可以用。默认UIAlertViewStyleDefault

@property(nonatomic,assign)UIAlertViewStyle alertViewStyle__OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_5_0);

/* Retrieve a text field at an index - raises NSRangeException when textFieldIndex is out-of-bounds. 

   The field at index 0 will be the first text field (the single field or the login field), the field at index 1 will be the password field. */

- (UITextField *)textFieldAtIndex:(NSInteger)textFieldIndex__OSX_AVAILABLE_STARTING(__MAC_NA,

三使用例子

    UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"提示" message:nil delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"登录", nil];    alertView.title =@"用户登录";    alertView.alertViewStyle = UIAlertViewStyleLoginAndPasswordInput;    [alertView show];

-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{    NSString *titleButon= [alertView buttonTitleAtIndex:buttonIndex];    if ([titleButon isEqualToString:@"登录"]) {        NSString *userName= [alertView textFieldAtIndex:0].text;        NSString *password= [alertView textFieldAtIndex:1].text;        NSLog(@"userName=%@,password=%@",userName,password);    }}

控制台输出：

2015-10-09 09:47:19.280 Xcode_learn[1317:50099] userName=tyyt,password=hhhh