有以下两种方法，个人推荐第二种：
(1)
```
floatversion = [[[UIDevicecurrentDevice]systemVersion]floatValue];
if(version == 7.0) {
_searchBar.backgroundColor= [UIColorclearColor];
_searchBar.barTintColor= [UIColorclearColor];
}else{
for(inti = 0 ;i <_searchBar.subviews.count;i++){
UIView* backView =_searchBar.subviews[i];
if([backViewisKindOfClass:NSClassFromString(@"UISearchBarBackground")] ==YES) {
[backViewremoveFromSuperview];
[_searchBarsetBackgroundColor:[UIColorclearColor]];
break;
}else{
NSArray* arr =_searchBar.subviews[i].subviews;
for(intj = 0;j
UIView* barView = arr[i];
if([barViewisKindOfClass:NSClassFromString(@"UISearchBarBackground")] ==YES) {
[barViewremoveFromSuperview];
[_searchBarsetBackgroundColor:[UIColorclearColor]];
break;
}
}
}
}
}
```
（2）
```
floatversion = [[[UIDevicecurrentDevice]systemVersion]floatValue];
if([_searchBarrespondsToSelector:@selector(barTintColor)]) {
floatiosversion7_1 = 7.1;
if(version >= iosversion7_1) {
[[[[_searchBar.subviewsobjectAtIndex:0]subviews]objectAtIndex:0]removeFromSuperview];
[_searchBarsetBackgroundColor:[UIColorclearColor]];
}
else{//iOS7.0
[_searchBarsetBarTintColor:[UIColorclearColor]];
[_searchBarsetBackgroundColor:[UIColorclearColor]];
}
}
else{
//iOS7.0以下
[[_searchBar.subviewsobjectAtIndex:0]removeFromSuperview];
[_searchBarsetBackgroundColor:[UIColorclearColor]];
}
```
转载自：http://blog.csdn.net/wjh15085872684/article/details/51604558
