UIAlertView及UIActionSheet在ios8中被放弃

其功能将完全由UIAlertController代替:

1.Alert用法

UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"This is Title"
                                                                   message:@"This is message"
                                                            preferredStyle:UIAlertControllerStyleAlert];
    [alert addAction:[UIAlertAction actionWithTitle:@"Action 1 (Default Style)"
                                              style:UIAlertActionStyleDefault
                                            handler:^(UIAlertAction *action) {
                                                NSLog(@"Action 1 Handler Called");
                                            }]];
    
    [alert addAction:[UIAlertAction actionWithTitle:@"Action 2 (Cancel Style)"
                                              style:UIAlertActionStyleCancel
                                            handler:^(UIAlertAction *action) {
                                                NSLog(@"Action 2 Handler Called");
                                            }]];
    
    [alert addAction:[UIAlertAction actionWithTitle:@"Action 3 (Destructive Style)"
                                              style:UIAlertActionStyleDestructive
                                            handler:^(UIAlertAction *action) {
                                                NSLog(@"Action 3 Handler Called");
                                            }]];

    [alert addTextFieldWithConfigurationHandler:^(UITextField *textField) {
        
        UITextField * tf = [[UITextField alloc]initWithFrame:CGRectMake(0, 0, 80, 30)];
    }];
    [self presentViewController:alert animated:YES completion:nil];

UIAlertController *alertController = [UIAlertController alertControllerWithTitle:nil message:nilpreferredStyle:UIAlertControllerStyleActionSheet];
    
    [alertController addAction:[UIAlertAction actionWithTitle:@"111"
                                                        style:UIAlertActionStyleDefault
                                                      handler:^(UIAlertAction *action) {
                                                          NSLog(@"111");
                                                      }]];
    [alertController addAction:[UIAlertAction actionWithTitle:@"222"
                                                        style:UIAlertActionStyleCancel
                                                      handler:^(UIAlertAction *action) {
                                                          NSLog(@"222");
                                                      }]];
    [self presentViewController:alertController animated:YES completion:nil];

版本判断语句

#define iOS(version) (([[[UIDevice currentDevice] systemVersion] intValue] >= version)?1:0)

可进行判断添加alertController或是aletView和actionsheet

3.新的问题,当在ios8下做好判断之后,返回ios7或ios6运行xcode,报错-------

原因:UIAlertController只在ios8下的框架里由此文件,ios7及以下版本没有,但编译的时候还是会进行编译(虽然运行时不走这部分代码)

解决方法:编译时进行判断,只有在ios8SDK下编译此部分

#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 80000

             "alertcontroller相关代码"

#endif

重新运行xcode,ok,可以正常运行了.

源博文：http://blog.csdn.net/shang1219178163/article/details/39519927

UIAlertView 和 UIAlertController