前言

相信很多人都在使用masory进行手动纯代码布局.而Masonry在代码的高可阅读性,和其优美的语法,也成为了我的首选.在大多数情况下,masonry 都可以很简单的就完成布局,但是在对UISCrollView进行自动布局时,会存在UISCrollView的子视图在超出UISCrollView边界后, UISCrollView 还无法滚动的问题,针对这个问题,本文举了一个简单的例子,Demo已上传GitHub

Masonry 在UISCrollView 上的使用

需要的控件

@property (nonatomic, readwrite, strong) UIScrollView *scrollView;//滚动视图
@property (nonatomic, readwrite, strong) UIView *mas_heighContentView;//用来获取contentSize 高度的视图
@property (nonatomic, readwrite, strong) UIView *contentView;//真正的scrollView 内部承载视图
@property (nonatomic, readwrite, strong) UIView *topView;//contentView的子视图,
@property (nonatomic, readwrite, strong) UIView *bottomView;//contentView的子视图,在这里会被设置为超过屏幕

层级

[self.view addSubview:self.scrollView];
    [self.scrollView addSubview:self.mas_heighContentView];
    [self.scrollView addSubview:self.contentView];
        [self.contentView addSubview:self.topView];
        [self.contentView addSubview:self.bottomView];

进行布局

[self.scrollView mas_remakeConstraints:^(MASConstraintMaker *make) {
    make.edges.equalTo(self.view);
}];
    [self.mas_heighContentView mas_remakeConstraints:^(MASConstraintMaker *make) {
        make.top.left.right.equalTo(self.scrollView);
        //这里的底部关联scrollView 最底部的视图,使self.contentView可以拿到 mas_height
        make.bottom.equalTo(self.bottomView);
    }];
    [self.contentView mas_remakeConstraints:^(MASConstraintMaker *make) {
        make.edges.equalTo(self.scrollView);
        //必须设置宽度 mas_right 对scrollView 没用
        make.width.equalTo(self.scrollView);
        
        //必须设置高度,用来撑开contentSize
        make.height.equalTo(self.mas_heighContentView);
    }];
        [self.topView mas_remakeConstraints:^(MASConstraintMaker *make) {
            make.top.equalTo(self.contentView).offset(50);
            make.centerX.equalTo(self.contentView);
            make.width.mas_equalTo(100);
            make.height.mas_equalTo(300);
        }];
            
        [self.bottomView mas_remakeConstraints:^(MASConstraintMaker *make) {
            make.top.equalTo(self.topView.mas_bottom).offset(200);
            make.centerX.equalTo(self.contentView);
            make.width.mas_equalTo(100);
            make.height.mas_equalTo(500);
        }];