[置顶] 设置UISearchBar 的_UISearchBarSearchFieldBackgroundView 控件的圆角

+ (UISearchBar*)homesearchBar {
UISearchBar *searchBar = [[UISearchBar alloc]init];
[searchBar setImage:[UIImage imageNamed:@"search"]
forSearchBarIcon:UISearchBarIconSearch state:UIControlStateNormal];
searchBar.placeholder = searchBarPlaceholder;
[searchBar changeLeftPlaceholder:searchBar.placeholder];
//    设置cornerRadius
UIView* backgroundView = [searchBar subViewOfClassName:@"_UISearchBarSearchFieldBackgroundView"];
backgroundView.layer.cornerRadius = 14.50f;
backgroundView.clipsToBounds = YES;
return searchBar;
}

新增一个UI View分类

- (UIView*)subViewOfClassName:(NSString*)className {
for (UIView* subView in self.subviews) {
if ([NSStringFromClass(subView.class) isEqualToString:className]) {
return subView;
}

UIView* resultFound = [subView subViewOfClassName:className];
if (resultFound) {
return resultFound;
}
}
return nil;
}