iOS更改UISearchBar里面的UITextField的frame以及去除UISearchBar的背景

1、自定义UISearchBar的子类MySearchBar,重写layoutSubviews方法。

代码：- (void)layoutSubviews {
[super layoutSubviews];

for (UIView *view in self.subviews)
{
if ([view isKindOfClass:NSClassFromString(@"UIView")] && view.subviews.count > 0) {
for (UIView *subview in view.subviews) {
if ([subview isKindOfClass:NSClassFromString(@"UITextField")]) {
UITextField *textField = (UITextField *)subview;
CGRect frame = textField.frame;
frame.size.height = 38;
textField.frame = frame;
textField.font = [UIFont fontWithName:@"Helvetica" size:17.0f];
break;
}
}
break;
}
}
}2、如果是由UISearchBar是在一个xib文件中定义的，则在awakeFromNib方法里做如下操作：
for (UIView *view in self.destinationSearchBar.subviews)
{
if ([view isKindOfClass:NSClassFromString(@"UIView")] && view.subviews.count > 0) {
[[view.subviews objectAtIndex:0] removeFromSuperview];

CGRect frame = view.frame;
CGFloat height = frame.size.height + 8;
frame.size.height = height;
view.frame = frame;
view.clipsToBounds = NO;
break;
}
}

如果是用alloc/init方法生成的，则在其对应的UViewController的viewDidLoad方法里添加代码