iOS UIAlertController 使用介绍

// 初始化一个一个UIAlertController
// 参数preferredStyle:是IAlertController的样式
// UIAlertControllerStyleAlert 创建出来相当于UIAlertView
// UIAlertControllerStyleActionSheet 创建出来相当于 UIActionSheet
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"提示" message:@"是否取消订单？" preferredStyle:(UIAlertControllerStyleAlert)];

// 创建按钮
UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"确定" style:(UIAlertActionStyleDefault) handler:^(UIAlertAction *action) {
NSLog(@"确定");
}];
// 注意取消按钮只能添加一个
UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:(UIAlertActionStyleCancel) handler:^(UIAlertAction *action) {
// 点击按钮后的方法直接在这里面写
NSLog(@"取消");
}];

//创建警告按钮
//    UIAlertAction *structlAction = [UIAlertAction actionWithTitle:@"警告" style:(UIAlertActionStyleDestructive) handler:^(UIAlertAction *action) {
//        NSLog(@"警告");
//    }];
//添加按钮 将按钮添加到UIAlertController对象上
[alertController addAction:okAction];
[alertController addAction:cancelAction];
//    [alertController addAction:structlAction];
//将UIAlertController模态出来 相当于UIAlertView show 的方法
UINavigationController *viewController = [self findViewController:self];
[viewController presentViewController:alertController animated:YES completion:nil];

//通过View找viewController
- (UINavigationController *)findViewController:(UIView *)sourceView
{
id target= sourceView;
while (target) {
target = ((UIResponder *)target).nextResponder;
if ([target isKindOfClass:[UINavigationController class]]) {
break;
}
}
return target;

}