系统UISearchBar效果图:
需求效果图:
两种方案:
我要评论UISearchBar上的放大镜图标, 修改Frame. 同时判断在有无文本内容更改placeholder的颜色.UISearchBar的Text有值后, 放大镜自动靠左特性, 让UISearchBar设置一个默认的Text, 在点击UISearchBar开始编辑后, 如果没有值,设置Text为则@"", 同时还要根据状态修改placeholderLabel的颜色.(太繁琐, 不推荐!)实现代码:
@interface ViewController () <UISearchBarDelegate>
/** xib搜索框 */
@property (weak, nonatomic) IBOutlet UISearchBar *searchBar;
/** 搜索图片(放大镜) */
@property (nonatomic, weak) UIImageView *imgV;
@end
@implementation ViewController
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
// 查找放大镜图片ImageView
for (UIImageView *imgV in _searchBar.subviews.firstObject.subviews.lastObject.subviews) {
if ([imgV isMemberOfClass:[UIImageView class]]) {
imgV.frame = CGRectMake(8, 7.5, 13, 13);
_imgV = imgV;
[_imgV addObserver:self forKeyPath:@"frame" options:NSKeyValueObservingOptionNew context:nil];
}
}
// 设置searchBar文本颜色
[self updateSeachBar];
}
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSKeyValueChangeKey,id> *)change context:(void *)context
{
// 修改放大镜Frame前, 移除观察者
[_imgV removeObserver:self forKeyPath:@"frame"];
// 修改Frame
_imgV.frame = CGRectMake(8, 7.5, 13, 13);
// 再次添加观察者
[_imgV addObserver:self forKeyPath:@"frame" options:NSKeyValueObservingOptionNew context:nil];
}
#pragma mark -UISearchBarDelegate代理方法
- (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar
{
if ([searchBar.text isEqualToString:searchBar.placeholder]) {
// 无文本时, 显示placeholder
searchBar.text = @"";
}
// 获取到UISearchBar中UITextField
UITextField *searchField = [searchBar valueForKey:@"_searchField"];
// 开始编辑要修改textColor颜色
searchField.textColor = [UIColor blackColor];
searchField.clearButtonMode = UITextFieldViewModeWhileEditing;
}
- (void)searchBarTextDidEndEditing:(UISearchBar *)searchBar
{
[self updateSeachBar];
}
#pragma mark -根据文本内容设置searchBar颜色及clearButtonMode
- (void)updateSeachBar
{
if ([_searchBar.text isEqualToString:@""]) {// 文本内容为空时
UITextField *searchField = [_searchBar valueForKey:@"_searchField"];
// 修改textColor为placeholderColor
searchField.textColor = [searchField valueForKeyPath:@"_placeholderLabel.textColor"];
searchField.text = searchField.placeholder;
// 去除右侧clearButton
searchField.clearButtonMode = UITextFieldViewModeNever;
}
}
- (void)dealloc
{
// 移除观察者
[_searchBar removeObserver:self forKeyPath:@"frame"];
}
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