去掉UISearchBar自带的的边框背景

去掉UISearchBar自带的的边框背景 ，分为ios7后和ios7前的解决方案，代码如下：

UISearchBar* searchbar = [[UISearchBar
alloc]initWithFrame:CGRectMake(5,
0, 310,
50)];

searchbar.tag =
1000;

searchbar.delegate =
self;

[cell
addSubview:searchbar];

for (UIView *view
in searchbar.subviews) {

// for before iOS7.0

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

[view
removeFromSuperview];

break;

}

// for later iOS7.0(include)

if ([view isKindOfClass:NSClassFromString(@"UIView")] && view.subviews.count
> 0) {

[[view.subviews
objectAtIndex:0]
removeFromSuperview];

break;

}

}