带有 AttributedTitle 的 IOS UIButton

Question

我在 View Controller 中有一个属性标题按钮，我希望我的按钮在我单击它时更改它的标题示例:“添加到收藏夹”(单击更改为)“删除收藏夹”。

- (IBAction)addToFav:(id)sender {
  NSMutableAttributedString *string,*string2;
  string = [[NSMutableAttributedString alloc] initWithString:@"Add To Favorite"];
  string2 = [[NSMutableAttributedString alloc] initWithString:@"Remove Favorite"];
  if([_btnFav.currentAttributedTitle isEqualToAttributedString:string]){
    NSAttributedString *attributedTitle = [_btnFav attributedTitleForState:UIControlStateNormal];
    NSMutableAttributedString *mas = [[NSMutableAttributedString alloc] initWithAttributedString:attributedTitle];
    [mas.mutableString setString:@"Add To Favorite"];
  } else {
    NSAttributedString *attributedTitle = [_btnFav attributedTitleForState:UIControlStateNormal];
    NSMutableAttributedString *mas = [[NSMutableAttributedString alloc] initWithAttributedString:attributedTitle];
    [mas.mutableString setString:@"Remove Favorite"];
  }
}

Answer 1

- (IBAction)addToFav:(id)sender{
  NSString *string = @"Add To Favorite";
  NSString *string2 = @"Remove Favorite";
  NSString *newTitle = nil;

  NSAttributedString *attributedTitle = [_btnFav attributedTitleForState:UIControlStateNormal];
  //check the title
  if([[attributedTitle string] isEqualToString:string]) {
    newTitle = string2;
  }
  else {
    newTitle = string;
  }
  //set the title to the button
  NSMutableAttributedString *mas = [[NSMutableAttributedString alloc] initWithString:newTitle];
  [_btnFav setAttributedTitle:mas forState:UIControlStateNormal];
}