目的:

• 利用UIScrollView中利用Masonry布局多个相同的子控件

5021565681209_.pic.jpg

@property (nonatomic, strong) UIScrollView           * channelScrollView;

- (void)initUI {
    self.channelScrollView = [[UIScrollView alloc] init];
    self.channelScrollView.backgroundColor = [UIColor yellowColor];
    self.channelScrollView.pagingEnabled = NO;
    [self.channelView addSubview:self.channelScrollView];
}

- (void)initLayout {
    UILabel *lastLabel = nil;
    NSArray *titleArray = @[@"热门",
                            @"热门",
                            @"热门",
                            @"热门",
                            @"热门",
                            @"热门",
                            @"热门",
                            @"热门",
                            @"热门",
                            @"热门",
                            @"热门"];
    
    for (NSUInteger i = 0; i < titleArray.count; ++i) {
        UILabel *label = [[UILabel alloc] init];
        label.numberOfLines = 0;
        label.text = titleArray[i];
        
        label.textAlignment = NSTextAlignmentCenter;
        label.backgroundColor = CYRandomColor;
        [self.channelScrollView addSubview:label];
        
        [label mas_makeConstraints:^(MASConstraintMaker *make) {
            make.top.offset(20);
            make.width.mas_equalTo(70);
            make.height.mas_equalTo(70);
            
            if (lastLabel) {
                make.left.mas_equalTo(lastLabel.mas_right).offset(12);
            } else {
                make.left.mas_equalTo(self.channelScrollView).offset(15);
            }
        }];
        
        lastLabel = label;
    }

    [self.channelScrollView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.width.mas_equalTo(self.view.mas_width);
        make.top.mas_equalTo(self.channelLabel.mas_bottom).offset(0);
        make.bottom.offset(0);
        make.right.mas_equalTo(lastLabel.mas_right).offset(15);
    }];
}

make.left.mas_equalTo(lastLabel.mas_right).offset(12);

• 设置子控件之间的间距

make.left.mas_equalTo(self.channelScrollView).offset(15);

• 设置子控件跟父控件的起始边距

make.right.mas_equalTo(lastLabel.mas_right).offset(15);

设置channelScrollView 可以滑动的最大宽度距离