iOS 一行代码实现单行多按钮单选按钮事例

1、经常有单行多按钮单选效果的设计，大多数人第一想到的就是for循环UI和frame来创建，但
是项目中又引入了 masonry框架，masonry原本就是做UI布局的，那可不可以利用起来呢？答案
是可以的；
2、下面就使用masonry来简单实现一下单行多按钮单选效果，并且默认第一个按钮为默认按钮的场景：

// @property (nonatomic,  strong) UIView *rootView;
// @property (nonatomic,  strong) UIButton *childSelectedBtn;//声明一个全局默认按钮
 
    NSMutableArray *arraychildView = [NSMutableArray new];
    NSArray *titlechildArr = @[@"班级",@"院校",@"省份"];
    for (int i = 0; i < titlechildArr.count; i++) {
        UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
        button.backgroundColor = [UIColor colorWithHexString:@"F3F4F5"];
        button.tag = 1000 + I;
        [button setTitleColor:[UIColor colorWithHexString:@"000000"] forState:UIControlStateNormal];
        [button setTitle: titlechildArr[i] forState:UIControlStateNormal];
        [button addTarget:self action:@selector(childAction:) forControlEvents:UIControlEventTouchUpInside];
        [self.rootView addSubview:button];
        [arraychildView addObject:button];
        if(button.tag == 1000) {
            self.childSelectedBtn = button;
            button.backgroundColor = [UIColor colorWithHexString:@"292A2E"];
            [button setTitleColor:[UIColor colorWithHexString:@"F1E5BF"] forState:UIControlStateNormal];
        }
    }
    [arraychildView mas_distributeViewsAlongAxis:MASAxisTypeHorizontal withFixedSpacing:7 leadSpacing:14 tailSpacing:14];
    [arraychildView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(self.titleChildLabel.mas_bottom).offset(14);
    }];
 
 
- (void)childAction:(UIButton *)sender {
    // 未选中
    if (self.childSelectedBtn) {
        self.childSelectedBtn.backgroundColor = [UIColor colorWithHexString:@"F3F4F5"];
        [self.childSelectedBtn setTitleColor:[UIColor colorWithHexString:@"000000"] forState:UIControlStateNormal];
    }
    // 选中
    self.childSelectedBtn = sender;
    self.childSelectedBtn.backgroundColor = [UIColor colorWithHexString:@"292A2E"];
    [self.childSelectedBtn setTitleColor:[UIColor colorWithHexString:@"F1E5BF"] forState:UIControlStateNormal];
 
}

3、以上代码虽然功能实现了，但是如果比较多的标签场景下，代码量就很多了，需要复制一份以上代码，这样无意中增加了冗余代码，视觉上变得毫无观感；
那还有更好的办法吗？答案是有的；可对此优化升级(包装函数)，代码如下：
引入头文件
 #import //(因为这里是动态赋值给到全局按钮)

/// 单行布局按钮 封装
/// - Parameters:
///   - titleArr: 按钮文字集合
///   - btntag: 按钮标识
///   - leadSpacing: 居左距离
///   - fixedSpacing: 中间间隙
///   - tailSpacing: 居右距离
///   - superLabel: 相对顶部label对象(这里可以根据自己的场景修改类型)
///   - topEqualToViewOffset: 相对上面的UI对象的间距
///   - globalButton: 将第一个按钮赋值给默认选中全局按钮  参数格式为：(selectedButton)
///   - subview: 添加到的父视图对象
///   - actionSEL: 按钮执行事件SEL
- (void)createLoopButtonWithTitleArr:(NSArray *)titleArr
                           buttonTag:(NSInteger)btntag
                         leadSpacing:(CGFloat)leadSpacing
                        fixedSpacing:(CGFloat)fixedSpacing
                         tailSpacing:(CGFloat)tailSpacing
                      topEqualToView:(UILabel *)superLabel
                topEqualToViewOffset:(CGFloat)topEqualToViewOffset
                    globalButtonName:(NSString *)globalButton
                          addSubview:(UIView *)subview
                              action:(SEL)actionSEL {
    
    NSMutableArray *arrayChildView = [NSMutableArray new];
    int countNum = (int)titleArr.count;
    for (int i = 0; i < countNum; i++) {
        UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
        button.backgroundColor = [UIColor colorWithHexString:@"F3F4F5"];
        [button setTitleColor:[UIColor colorWithHexString:@"000000"] forState:UIControlStateNormal];
        button.titleLabel.font = [UIFont fontWithName:kFontRegular size:12];
        button.tag = btntag + i;
        [button setTitle:titleArr[i] forState:UIControlStateNormal];
        [button addTarget:self action:actionSEL forControlEvents:UIControlEventTouchUpInside];
        [subview addSubview:button];
        [arrayChildView addObject:button];
        if(button.tag == btntag) {
            if (globalButton && globalButton.length > 0) {
                globalButton = [globalButton stringByReplacingCharactersInRange:NSMakeRange(0,1) withString:[[globalButton substringToIndex:1] capitalizedString]];
                ((void(*)(id,SEL,id))objc_msgSend)(self, NSSelectorFromString([[@"set" stringByAppendingString:globalButton] stringByAppendingString:@":"]),button);
            }
            button.backgroundColor = [UIColor colorWithHexString:@"292A2E"];
            [button setTitleColor:[UIColor colorWithHexString:@"F1E5BF"] forState:UIControlStateNormal];
        }
    }
    [arrayChildView mas_distributeViewsAlongAxis:MASAxisTypeHorizontal withFixedSpacing:fixedSpacing leadSpacing:leadSpacing tailSpacing:tailSpacing];
    [arrayChildView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(superLabel.mas_bottom).offset(topEqualToViewOffset);
    }];
}
 

一行代码实现单行单选按钮事例：

    [self createLoopButtonWithTitleArr:@[@"半年内",@"一年内",@"两年内"] buttonTag:100 leadSpacing:14 fixedSpacing:7 tailSpacing:14 topEqualToView:self.titleNameLabel topEqualToViewOffset:14 globalButtonName:@"childSelectedBtn" addSubview:self.rootView action:@selector(childAction:)];