iOS UISearchBar改变搜索框的颜色

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 //搜索框  
 - (UISearchBar *)searchBar{  
     if (_searchBar == nil) {  
         _searchBar = [[UISearchBar alloc]initWithFrame:CGRectMake(0, 27, KScreenWidth, 30)];  
         _searchBar.placeholder = @"请输入搜索内容";  
         _searchBar.backgroundImage = [[UIImage alloc] init];  
         _searchBar.delegate = self;  
         _searchBar.tintColor =  LHColor(196, 196, 196);  
         //取出textfield  
           
         UITextField *searchField=[_searchBar valueForKey:@"_searchField"];  
           
 //        searchField.backgroundColor = [UIColor grayColor];  
 //        searchField.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageWithContentsOfFile:@"ic_map_topbar_search"]];  
 //        searchField.background = [UIImage imageNamed:@"ic_map_topbar_search"];  
         //改变searcher的textcolor  
         searchField.borderStyle = UITextBorderStyleNone;  
 //        searchField.background = [UIImage imageNamed:@"ic_top"];  
         searchField.backgroundColor = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.3];  
         searchField.layer.cornerRadius = 4.0;  
         searchField.leftViewMode=UITextFieldViewModeNever;  
         searchField.textColor=[UIColor whiteColor];  
         //改变placeholder的颜色  
           
         [searchField setValue:[UIColor whiteColor]forKeyPath:@"_placeholderLabel.textColor"];  
     }  
     return _searchBar;  
 }  