UISearchBar的外观自定义，打造你的搜索框

前言

在App的开发中，搜索框是必不可少的。但是苹果给我们提供的搜索框有点差强人意。没有达到我们预想的效果。为了满足我们的需求，我们就要打造属于自己的搜索框。今天就详细介绍如何打造可定制的搜索框。

系统默认的搜索框

1、效果如下：

2、代码如下：

-(void)defualtSysSearchBar{
    NetWorkSearchBar = [[UISearchBar alloc]initWithFrame:CGRectMake(30, 100, 300, 40)];
    NetWorkSearchBar.placeholder = @"搜一搜";
    [self.view addSubview:NetWorkSearchBar];
}

综上显示，所述：我们看到系统为我们提供的搜索框，我们不能直接使用。

第一、去掉系统搜索框后面灰色的背景

1、代码如下：

#pragma mark 去掉后面的灰色背景
-(void)disMissBackColor{
    NetWorkSearchBar = [[UISearchBar alloc]initWithFrame:CGRectMake(30, 100, 300, 40)];
    NetWorkSearchBar.placeholder = @"搜一搜";
    // 去掉背景
    NetWorkSearchBar.backgroundImage = [UIImage new];
    [self.view addSubview:NetWorkSearchBar];
}

2、效果如下：

第二、修改系统搜索框的背景色

1、代码如下：

#pragma mark 修改SearchBar 后面背景色（不可以用于完全去掉背景色）
-(void)setUpSearchBarBarBackGroundColor{
    NetWorkSearchBar = [[UISearchBar alloc]initWithFrame:CGRectMake(30, 100, 300, 40)];
    NetWorkSearchBar.placeholder = @"搜一搜";
    NetWorkSearchBar.barTintColor = [UIColor redColor];
    [self.view addSubview:NetWorkSearchBar];
}

2、效果如下：

注意了，该方法不可以用来清除搜索框的背景色。因为通过代码将颜色设置为白色后的效果如下图所示：

第三、显示取消（Cancle），并将英文改为中文和设置文字的颜色

1、显示取消英文的代码如下：

#pragma mark 显示取消的SearchBar
-(void)showEngCancleSearchBar{
    NetWorkSearchBar = [[UISearchBar alloc]initWithFrame:CGRectMake(30, 100, 300, 40)];
    NetWorkSearchBar.placeholder = @"搜一搜";
    NetWorkSearchBar.showsCancelButton = YES;
    [self.view addSubview:NetWorkSearchBar];
}

2、英文取消效果如下：

3、修改为中文和颜色

#pragma mark 修改显示的取消为中文
-(void)modificationTitleAndColorOfSearchBar{
    NetWorkSearchBar = [[UISearchBar alloc]initWithFrame:CGRectMake(30, 100, 300, 40)];
    NetWorkSearchBar.placeholder = @"搜一搜";
    NetWorkSearchBar.showsCancelButton = YES;
    if (@available(iOS 9.0 ,*)) {
        [[UIBarButtonItem appearanceWhenContainedInInstancesOfClasses:@[[UISearchBar class]]] setTitle:@"取消"];
        [[UIBarButtonItem appearanceWhenContainedInInstancesOfClasses:@[[UISearchBar class]]] setTintColor:[UIColor redColor]];
    }else{
        [[UIBarButtonItem appearanceWhenContainedIn:[UISearchBar class], nil] setTitle:@"取消"];
        [[UIBarButtonItem appearanceWhenContainedIn:[UISearchBar class], nil] setTintColor:[UIColor redColor]];
    }
    [self.view addSubview:NetWorkSearchBar];
}

4、修改后中文效果如下:

第四、修改搜索框里的光标的颜色

1、代码如下：

#pragma mark 修改搜索框里的光标颜色
-(void)modificationCursorOfSearchBar{
    NetWorkSearchBar = [[UISearchBar alloc]initWithFrame:CGRectMake(30, 100, 300, 40)];
    NetWorkSearchBar.placeholder = @"搜一搜";
    NetWorkSearchBar.showsCancelButton = YES;
    if (@available(iOS 9.0 ,*)) {
        [[UIBarButtonItem appearanceWhenContainedInInstancesOfClasses:@[[UISearchBar class]]] setTitle:@"取消"];
        [[UIBarButtonItem appearanceWhenContainedInInstancesOfClasses:@[[UISearchBar class]]] setTintColor:[UIColor redColor]];
    }else{
        [[UIBarButtonItem appearanceWhenContainedIn:[UISearchBar class], nil] setTitle:@"取消"];
        [[UIBarButtonItem appearanceWhenContainedIn:[UISearchBar class], nil] setTintColor:[UIColor redColor]];
    }
    // 修改光标
    NetWorkSearchBar.tintColor = [UIColor greenColor];
    [self.view addSubview:NetWorkSearchBar];
}

2、效果如下：

第五、给系统搜索框内置框添加切角和边线

1、代码如下：

#pragma mark 给搜索框内置框添加边线和切角
-(void)addLineOfSearchBar{
    NetWorkSearchBar = [[UISearchBar alloc]initWithFrame:CGRectMake(30, 100, 300, 40)];
    NetWorkSearchBar.placeholder = @"搜一搜";
    UITextField * SearchBarTextField = [NetWorkSearchBar valueForKey:@"searchField"];
    SearchBarTextField.layer.masksToBounds = YES;
    SearchBarTextField.layer.cornerRadius = 10.0;
    SearchBarTextField.layer.borderWidth = 1.0;
    SearchBarTextField.layer.borderColor = [UIColor redColor].CGColor;
    [self.view addSubview:NetWorkSearchBar];
}

2、效果如下：

第六：修改搜索框的提示文字的颜色和大小

1、代码如下：

#pragma mark 修改搜索框的提示文字大小和颜色
-(void)modificationPlaceholderOfSearchBar{
    NetWorkSearchBar = [[UISearchBar alloc]initWithFrame:CGRectMake(30, 100, 300, 40)];
    UITextField * SearchBarTextField = [NetWorkSearchBar valueForKey:@"searchField"];
    NSAttributedString * str = [[NSAttributedString alloc]initWithString:@"搜一搜" attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:18],NSForegroundColorAttributeName:[UIColor greenColor]}];
    [SearchBarTextField setAttributedPlaceholder:str];
    [self.view addSubview:NetWorkSearchBar];
}

2、效果如下：

第七、修改搜索框里的搜索图片、取消按钮图片、书页图片、搜索结果下拉列表的图片

1、代码如下：

#pragma mark 更换搜索框里的搜索图片
-(void)replaceSearchImageOfSearchBar{
    NetWorkSearchBar = [[UISearchBar alloc]initWithFrame:CGRectMake(30, 100, 300, 40)];
    NetWorkSearchBar.placeholder = @"搜一搜";
    [NetWorkSearchBar setImage:[UIImage imageNamed:@"w22"] forSearchBarIcon:UISearchBarIconSearch state:UIControlStateNormal];
    [self.view addSubview:NetWorkSearchBar];
}

2、效果如下：

八、自定义搜索框

1、代码如下：

#pragma mark 给你搜索框添加按钮
-(void)addBtnInSearchBar{
    NetWorkSearchBar = [[UISearchBar alloc]initWithFrame:CGRectMake(30, 100, 300, 40)];
    NetWorkSearchBar.delegate = self;
    NetWorkSearchBar.placeholder = @"搜一搜";
    [self.view addSubview:NetWorkSearchBar];
    // 要添加的按钮
    VideoBtn = [UIButton buttonWithType:UIButtonTypeCustom];
    [VideoBtn setImage:[UIImage imageNamed:@"vio"] forState:UIControlStateNormal];
    [VideoBtn addTarget:self action:@selector(viodeClick) forControlEvents:UIControlEventTouchDragInside];
    // 将其添加到搜索框内
    [NetWorkSearchBar addSubview:VideoBtn];
    // 设置添加按钮的约束条件
    VideoBtn.translatesAutoresizingMaskIntoConstraints = NO;
    NSDictionary * Views = NSDictionaryOfVariableBindings(VideoBtn);
    // 设置水平约束
    [NetWorkSearchBar addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"[VideoBtn(21)]-|" options:NSLayoutFormatAlignAllRight | NSLayoutFormatAlignAllLeft metrics:nil views:Views]];
    // 设置高度约束
    [NetWorkSearchBar addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"[VideoBtn(21)]-|" options:NSLayoutFormatAlignAllTop | NSLayoutFormatAlignAllBottom metrics:nil views:Views]];
    //设置垂直方向居中约束
    [NetWorkSearchBar addConstraint:[NSLayoutConstraint constraintWithItem:VideoBtn attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:NetWorkSearchBar attribute:NSLayoutAttributeCenterY multiplier:1 constant:0]];
}
-(void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText{
    VideoBtn.hidden = searchText.length>0;
}
-(void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar{
    VideoBtn.hidden = YES;
}
// 点击事件
-(void)viodeClick{
    
}

2、效果如下：