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 = [UIAlertControlleralertControllerWithTitle:@"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