UISearchBar 修改背景颜色透明

UISearchBar *search=[[UISearchBar alloc]initWithFrame:CGRectMake(0, 100, self.view.frame.size.width, 100)];

[search setPlaceholder:@"搜索"];

[search setPrompt:@"我的搜索"];

//    [search setBarStyle:UIBarStyleBlackTranslucent];

//    [search setTintColor:[UIColor redColor]];

//    [search setSearchFieldBackgroundImage:[UIImage imageNamed:@"2"] forState:UIControlStateNormal];

//    //3自定义背景

//

//    UITextField *searchField = [search valueForKey:@"_searchField"];

//    searchField.textColor = [UIColor redColor];

//    [searchField setValue:[UIColor whiteColor] forKeyPath:@"_placeholderLabel.textColor"];

//

//

//    //修改放大镜图片

//    UIImage *image = [UIImage imageNamed:@"cl_tab2_gray"];

//    UIImageView *iconView = [[UIImageView alloc] initWithImage:image];

//    iconView.frame = CGRectMake(0, 0, image.size.width , image.size.height);

//    searchField.leftView = iconView;

//让背景透明

for (UIView *subview in search.subviews) {

for(UIView* grandSonView in subview.subviews){

if ([grandSonView isKindOfClass:NSClassFromString(@"UISearchBarBackground")]) {

grandSonView.alpha = 0.5f;

}else if([grandSonView isKindOfClass:NSClassFromString(@"UISearchBarTextField")] ){

NSLog(@"Keep textfiedld bkg color");

}else{

grandSonView.alpha = 0.0f;

}

}//for cacheViews

}//subviews

[self.view addSubview:search];