```
#pragma mark - 搜索栏
//添加方法一 （此方法当界面消失时，需要在viewWillDisappear方法中remove掉UISearchBar……所以建议使用第二种添加方法）
//CGRect mainViewBounds = self.navigationController.view.bounds;
//self.searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(CGRectGetWidth(mainViewBounds)/2-((CGRectGetWidth(mainViewBounds)-120)/2), CGRectGetMinY(mainViewBounds)+28, CGRectGetWidth(mainViewBounds)-120, 30)];
//添加到view中
//[self.navigationController.view addSubview:self.searchBar];
//添加方法二
UIView*titleView = [[UIViewalloc]initWithFrame:CGRectMake(0,0,ScreenW-100,30)];
//UIColor *color = self.navigationController.navigationBar.tintColor;
//[titleView setBackgroundColor:color];
self.searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 0, ScreenW - 100, 30)];
self.searchBar.placeholder = @"请输入流水号、商品信息或会员信息";
self.searchBar.layer.cornerRadius = 15;
self.searchBar.layer.masksToBounds = YES;
//设置背景图是为了去掉上下黑线
self.searchBar.backgroundImage = [[UIImage alloc] init];
//self.searchBar.backgroundImage = [UIImage imageNamed:@"sexBankgroundImage"];
// 设置SearchBar的主题颜色
//self.searchBar.barTintColor = [UIColor colorWithRed:111 green:212 blue:163 alpha:1];
//设置背景色
self.searchBar.backgroundColor = [UIColor colorWithRed:0/255.0f green:0/255.0f blue:0/255.0f alpha:0.1];
// 修改cancel
self.searchBar.showsCancelButton=NO;
self.searchBar.barStyle=UIBarStyleDefault;
self.searchBar.keyboardType=UIKeyboardTypeNamePhonePad;
//self.searchBar.searchBarStyle = UISearchBarStyleMinimal;//没有背影，透明样式
self.searchBar.delegate=self;
// 修改cancel
self.searchBar.showsSearchResultsButton=NO;
//5. 设置搜索Icon
[self.searchBar setImage:[UIImage imageNamed:@"Search_Icon"] forSearchBarIcon:UISearchBarIconSearch state:UIControlStateNormal];
/*这段代码有个特别的地方就是通过KVC获得到UISearchBar的私有变量
searchField（类型为UITextField），设置SearchBar的边框颜色和圆角实际上也就变成了设置searchField的边框颜色和圆角，你可以试试直接设置SearchBar.layer.borderColor和cornerRadius，会发现这样做是有问题的。*/
//一下代码为修改placeholder字体的颜色和大小
UITextField*searchField = [_searchBarvalueForKey:@"_searchField"];
//2. 设置圆角和边框颜色
if(searchField) {
[searchFieldsetBackgroundColor:[UIColor clearColor]];
// searchField.layer.borderColor = [UIColor colorWithRed:49/255.0f green:193/255.0f blue:123/255.0f alpha:1].CGColor;
// searchField.layer.borderWidth = 1;
// searchField.layer.cornerRadius = 23.0f;
// searchField.layer.masksToBounds = YES;
// 根据@"_placeholderLabel.textColor" 找到placeholder的字体颜色
[searchFieldsetValue:[UIColor colorWithRed:200/255.0f green:200/255.0f blue:200/255.0f alpha:1] forKeyPath:@"_placeholderLabel.textColor"];
}
// 输入文本颜色
searchField.textColor= [UIColorwhiteColor];
searchField.font= [UIFontsystemFontOfSize:15];
// 默认文本大小
[searchFieldsetValue:[UIFont boldSystemFontOfSize:13] forKeyPath:@"_placeholderLabel.font"];
//只有编辑时出现出现那个叉叉
searchField.clearButtonMode = UITextFieldViewModeWhileEditing;
[titleViewaddSubview:self.searchBar];
//Set to titleView
self.navigationItem.titleView = titleView;
```
