最近手机更新了iOS11系统，把项目在手机上运行之后发现原来正常大小的searchBar高度明显增加了，放在导航栏上更为明显。就想着要把searchBar的高度改一下，在网上搜了一下全都一样，而且还是用swift写的，所以就想着按照那个方法写一个OC版本的（参考文章地址：www.cnblogs.com/theDesertIslandOutOfTheWorld/p/5015653.html）。
iOS11系统的searchBar
iOS10.3系统的searchBar
具体的UISearchBar的中子控件及其布局可以参考原文章的分析，现在直接上代码
新建UISearchBar的子类，增加成员属性contentInset，用来调整UISearchBarTextField距离父控件的边距。contentInset的setter方法
#pragma mark - setter method
- (void)setContentInset:(UIEdgeInsets)contentInset {
_contentInset.top = contentInset.top;
_contentInset.bottom = contentInset.bottom;
_contentInset.left = contentInset.left;
_contentInset.right = contentInset.right;
self.isChangeFrame = YES;
[self layoutSubviews];
}
- (void)layoutSubviews {
[super layoutSubviews];
for (UIView *subView in self.subviews[0].subviews) {
if ([subView isKindOfClass:[UIImageView class]]) {
//移除UISearchBarBackground
[subView removeFromSuperview];
}
if ([subView isKindOfClass:[UITextField class]]) {
CGFloat height = self.bounds.size.height;
CGFloat width = self.bounds.size.width;
if (_isChangeFrame) {
//说明contentInset已经被赋值
// 根据contentInset改变UISearchBarTextField的布局
subView.frame = CGRectMake(_contentInset.left, _contentInset.top, width - 2 * _contentInset.left, height - 2 * _contentInset.top);
} else {
// contentSet未被赋值
// 设置UISearchBar中UISearchBarTextField的默认边距
CGFloat top = (height - 28.0) / 2.0;
CGFloat bottom = top;
CGFloat left = 8.0;
CGFloat right = left;
_contentInset = UIEdgeInsetsMake(top, left, bottom, right);
}
}
}
}
使用
- (MySelfSearchBar *)addSearchBarWithFrame:(CGRect)frame {
self.definesPresentationContext = YES;
MySelfSearchBar *searchBar = [[MySelfSearchBar alloc]initWithFrame:frame];
searchBar.delegate = self;
searchBar.searchBarStyle = UISearchBarStyleDefault;
searchBar.placeholder = @"查询";
[searchBar setShowsCancelButton:NO];
[searchBar setTintColor:KGenericColor];
if (self.isChangeSearchBarFrame || IS_IOS_11) {
CGFloat height = searchBar.bounds.size.height;
CGFloat top = (height - 20.0) / 2.0;
CGFloat bottom = top;
searchBar.contentInset = UIEdgeInsetsMake(top, 0, bottom, 0);
}
return searchBar;
}
加载到导航栏上
MySelfSearchBar *searchBar = [self addSearchBarWithFrame:CGRectMake(0, 0, kScreenWidth - 2 * 44 - 2 * 15, 44)];
UIView *wrapView = [[UIView alloc] initWithFrame:searchBar.frame];
[wrapView addSubview:searchBar];
self.navigationItem.titleView = wrapView;
通过新增属性contentInset来改变searchBar的高度
运行结果
改变与父控件的边距后效果
demo地址：https://github.com/DreamTravelingLight/searchBarDemo.git
以前的源码没了，就简单的写了一下，明白了原理可以根据自己的项目再写一个
