ios - 搜索栏 subview 不工作，并且没有为搜索栏调用 UITextField 委托(delegate)方法

Question

请看我下面的代码:

我的 viewController 中有一个搜索栏

 for (UIView *subView in  self.searchBar.subviews) 
     {
      if([subView conformsToProtocol:@protocol(UITextInputTraits)]) 
       {      
        [(UITextField *)subView setDelegate:self];
        [(UITextField *)subView setReturnKeyType:UIReturnKeyDefault];
        [(UITextField *)subView setBackground:[UIImage imageNamed:@"shopping-Search"]];
      }
    }

for (UIView *subview in self.searchBar.subviews) {
    if ([subview isKindOfClass:NSClassFromString(@"UISearchBarBackground")]) {
        [subview removeFromSuperview];
        break;
    }
}

此代码在 iOS 6 中运行良好，但在 iOS 7 中无法运行。

Answer 1

iOS7 中的 searchBar subview 层次结构已更改，请尝试以下操作:

iOS7:

NSArray *searchBarSubViews = [[self.searchBar.subviews objectAtIndex:0] subviews];

iOS6 及之前版本:

NSArray *searchBarSubViews =  self.searchBar.subviews;

试试下面更新的函数:

for (UIView *subView in searchBarSubViews) {
      if([subView conformsToProtocol:@protocol(UITextInputTraits)]) 
       {      
        [(UITextField *)subView setDelegate:self];
        [(UITextField *)subView setReturnKeyType:UIReturnKeyDefault];
        [(UITextField *)subView setBackground:[UIImage imageNamed:@"shopping-Search"]];
      }
}

for (UIView *subview in searchBarSubViews) {
    if ([subview isKindOfClass:NSClassFromString(@"UISearchBarBackground")]) {
        [subview removeFromSuperview];
        break;
    }
}