进击的UI----------------UISearchBar(搜索框)

谓词

self.searchBar = [[UISearchBar alloc]initWithFrame:CGRectMake(0, 100, CGRectGetWidth(self.frame), 40)];

    [self addSubview:_searchBar];
    // 占位符
    [self.searchBar setPlaceholder:@"请输入"];
    // 换颜色
    [self.searchBar setBarStyle:UIBarStyleBlackOpaque];
    // 显示右侧
    [self.searchBar setShowsBookmarkButton:YES];
    // 显示右侧取消按钮
    [self.searchBar setShowsCancelButton:YES animated:YES];
    // 显示搜索结果

    [self.searchBar setShowsSearchResultsButton:YES];

代理:

1.引入代理

@interface RootViewController ()<UISearchBarDelegate>

2.设置代理

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    self.rv.searchBar.delegate = self;

}

3.调用方法

- (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar{
    NSLog(@"cancel");

}

- (void)searchBarResultsListButtonClicked:(UISearchBar *)searchBar{
    NSLog(@"搜索已按下");
    NSLog(@"%@",searchBar.text);
}
- (BOOL)searchBar:(UISearchBar *)searchBar shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text{
    NSLog(@"start");
    return YES;

}