IOS8以上版本，使用UIAlertController代替 UIActionSheet和UIAlertView

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IOS8以上版本，使用UIAlertController代替 UIActionSheet和UIAlertView

标签： IOSUIAlertControllerUIActionSheet按钮颜色

2015-10-16 15:19 9026人阅读评论(0) 收藏举报

分类：

IOS（26）

苹果在IOS8版本上，新添加了一个UIAlertController用来代替 UIActionSheet 和 UIAlertView；

在工作中，会遇到修改这两个控件按钮颜色的要求，在网上一看，多是采用下边这种方法的：

- (void)willPresentActionSheet:(UIActionSheet *)actionSheet
{
  DDLogDebug(@"%@",actionSheet.subviews);
  for (UIView *subview in actionSheet.subviews) {
  if ([subview isKindOfClass:[UIButton class]]) {
  UIButton *button = (UIButton *)subview;

[button setTitleColor:APP_TINT_COLOR forState:UIControlStateHighlighted];
[button setTitleColor:APP_TINT_COLOR forState:UIControlStateNormal];
[button setTitleColor:APP_TINT_COLOR forState:UIControlStateSelected];
}
}
}

但是在IOS8以后，无论是UIActionSheet、UIAlertView还是其他的一些控件的subviews就一直是空，不能返回任何UIView。所以在程序中根据系统版本采用不同的实现方式才是行之有效的，下面是UIAlertController的简单使用：

if ([[XWGlobalHelper systemVersion] intValue] > 7.99) {
  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 = [[UIImagePickerControlleralloc] init];
   imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
   imagePicker.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
     // imagePicker.allowsEditing = YES;
   imagePicker.allowsEditing = NO;
   imagePicker.delegate = self;
   [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 = self;
     // 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:nilotherButtonTitles:@"相机",@"从相册选择", nil];
actionSheet.actionSheetStyle = UIActionSheetStyleBlackOpaque;
actionSheet.delegate = self;
[actionSheet showInView:self.view];
}

上边的UIAlertControllerStyleActionSheet指定了显示效果为之前版本的UIActionSheet，另外还有一个UIAlertControllerStyleAlert指定了显示效果为之前版本的UIAlertView!

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