UISearchBar透明背景视图

Question

在UISearchBar中,默认情况下应该显示背景视图.怎么隐藏？我只需要在UISearchBar中搜索textview部分.

Answer 1

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

Answer 2

这里有一个适用于iOS 5和iOS 6的解决方案.我已经检查过没有必要更改任何其他属性(比如将backgroundColor设置为[UIColor clearColor])以使其工作.

for (UIView * v in searchBar.subviews) {
    if ([v isKindOfClass:NSClassFromString(@"UISearchBarTextField")]) {
        v.superview.alpha = 0;
        UIView *containerView = [[UIView alloc] initWithFrame:searchBar.frame];
        [containerView addSubview:v];
        [self.view addSubview:containerView];
    }
}

Answer 3

从iOS 5开始,我建议采用以下方式,这样可以避免弄乱未记录的子视图.更换self用self.searchBar,如果你继承了UISearchBarController,而不是本身的UISearchBar的.

// transparency for UISearchBar
self.translucent = YES;
self.backgroundImage = [UIImage new];
self.scopeBarBackgroundImage = [UIImage new];

作为奖励:

// transparency for UIToolbar
self.translucent = YES;
[self setBackgroundImage:[UIImage new] forToolbarPosition:UIToolbarPositionAny barMetrics:UIBarMetricsDefault];
[self setShadowImage:[UIImage new] forToolbarPosition:UIToolbarPositionAny];

// transparency for UINavigationBar
self.translucent = YES;
[self setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];
self.shadowImage = [UIImage new];

// transparency for UITabBar
self.backgroundImage = [UIImage new];
self.shadowImage = [UIImage new];

Answer 4

更新:从iOS 5.0开始,如果您有可用的背景图像,现在可以执行此操作

searchBar.backgroundImage = someUIImage;

(仅在iOS 6上测试过,因此可能会在5上进行测试!请检查一下.)

布兰登的答案不再适用(或者不适合我,所以我环顾四周并注意到:

(gdb) po [searchBar subviews]
<__NSArrayM 0x665ab80>(
<UISegmentedControl: 0x63aad80; frame = (0 0; 225 44); opaque = NO; layer = <CALayer: 0x6368420>>,
<UISearchBarBackground: 0x6347280; frame = (0 0; 225 44); layer = <CALayer: 0x638a230>>,
<UISearchBarTextField: 0x6331110; frame = (0 0; 0 0); clipsToBounds = YES; opaque = NO; layer = <CALayer: 0x63a20f0>>
)

第三个条目是一个自定义文本字段,大概是我想要的那个,我想,但是从superview中删除子视图0和1并没有奇怪地解决它.我最终得到了以下内容,它确实有效:

UITextField *sbTextField = (UITextField *)[searchBar.subviews lastObject];
[sbTextField removeFromSuperview];
[self.view addSubview:sbTextField];
sbTextField.frame = searchBar.frame;
[searchBar removeFromSuperview];

为了使其更加健壮,检查该类是文本字段的子类可能是个好主意,但除非它中断,我只是简单地说.

编辑:切换objectAtIndex:2到lastObject作为tipycalFlow建议.

Answer 5

对于寻找答案的未来访客.我发现以下内容在iOS 5+中有效并且更喜欢它,因为它不涉及搞乱UISearchBar本身的布局.

UISearchBar * search = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 44)];
[search setBackgroundColor:[UIColor clearColor]];
[search setPlaceholder:@"Search"];

for (UIView * v in [search subviews]) {
    if (![v isKindOfClass:[UITextField class]]) {
        v.alpha = 0;
    }
}

[header addSubview:search];
[search release];

Answer 6

UISearchBar 背景无法通过公共方法隐藏（分配透明颜色，因为这tintColor没有帮助）。

如果您想精确控制文本字段的样式，则应该使用 UITextField。