iOS9 UIAlertView的简单使用

@interface  ViewController ()<UIImagePickerControllerDelegate,UIActionSheetDelegate,
UINavigationControllerDelegate>

//调用UIAlertController
-(void)callUIAlertController{
    __weak typeof(self) weakSelf = self;
    if ([[[UIDevice currentDevice ]systemVersion]intValue] >=8.0) {
        UIAlertController *alertController = [UIAlertController alertControllerWithTitle:nil message:nil preferredStyle:UIAlertControllerStyleActionSheet];
        
        UIAlertAction* cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * action) {}];
        
        UIAlertAction* fromPhotoAction = [UIAlertAction actionWithTitle:@"从相册选择" style:UIAlertActionStyleDefault                                                                 handler:^(UIAlertAction * action) {                                                                     UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
            imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
            imagePicker.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
            //        imagePicker.allowsEditing = YES;
            imagePicker.allowsEditing = NO;
            imagePicker.delegate = weakSelf;
            [self presentViewController:imagePicker animated:YES completion:nil];
        }];
        UIAlertAction* fromCameraAction = [UIAlertAction actionWithTitle:@"相机" style:UIAlertActionStyleDefault                                                             handler:^(UIAlertAction * action) {
            if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
            {
                UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
                imagePicker.delegate = weakSelf;
                //            imagePicker.allowsEditing = YES;
                imagePicker.allowsEditing = NO;
                imagePicker.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
                imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
                [self presentViewController:imagePicker animated:YES completion:nil];
            }
        }];
        [alertController addAction:cancelAction];
        [alertController addAction:fromCameraAction];
        [alertController addAction:fromPhotoAction];
        [self presentViewController:alertController animated:YES completion:nil];
    } else {
        UIActionSheet * actionSheet = [[UIActionSheet alloc] initWithTitle:nil delegate:self cancelButtonTitle:@"取消" destructiveButtonTitle:nil otherButtonTitles:@"相机",@"从相册选择", nil];
        actionSheet.actionSheetStyle = UIActionSheetStyleBlackOpaque;
        actionSheet.delegate = weakSelf;
        [actionSheet showInView:weakSelf.view];
    }
}