UIScrollView+Masonry 解决view展示异常-白红宇

原因：

UIScrollView的leading、 trailing、top、bottom属性由ContentSize决定

ContentSize是根据子视图决定，相互依赖无法正常布局

例：

UIScrollView * scrollView = [[UIScrollView alloc] initWithFrame:self.view.bounds];    UIView * view1 = [[UIView alloc] init];    view1.backgroundColor = [UIColor redColor];        UIView * view2 = [[UIView alloc] init];    view1.backgroundColor = [UIColor blueColor];        [scrollView addSubview:view1];    [scrollView addSubview:view2];    [self.view addSubview:scrollView];        [self.scrollView mas_makeConstraints:^(MASConstraintMaker *make){        make.edges.mas_equalTo(UIEdgeInsetsZero);    }];        [view1 mas_makeConstraints:^(MASConstraintMaker *make) {        make.top.left.right.bottom.offset(0);        make.mas_equalTo(view2.mas_bottom);    }];        [view2 mas_makeConstraints:^(MASConstraintMaker *make) {        make.top.left.right.bottom.offset(15);    }];复制代码

解决：

创建一个大小等于其ContentSize的View覆盖到ScrollView上

其他子视图添加到这个View上

UIScrollView * scrollView = [[UIScrollView alloc] initWithFrame:self.view.bounds];        UIView * containView = [[UIView alloc] init];    containView.backgroundColor = [UIColor greenColor];        UIView * view1 = [[UIView alloc] init];    view1.backgroundColor = [UIColor redColor];        UIView * view2 = [[UIView alloc] init];    view1.backgroundColor = [UIColor blueColor];        [containView addSubview:view1];    [containView addSubview:view2];    [scrollView addSubview:containView];    [self.view addSubview:scrollView];        [self.scrollView mas_makeConstraints:^(MASConstraintMaker *make){        make.edges.mas_equalTo(UIEdgeInsetsZero);    }];        [containView mas_makeConstraints:^(MASConstraintMaker *make) {        make.edges.equalTo(scrollView);        make.width.height.equalTo(scrollView);    }];        [view1 mas_makeConstraints:^(MASConstraintMaker *make) {        make.top.left.right.bottom.offset(0);        make.mas_equalTo(view2.mas_bottom);    }];        [view2 mas_makeConstraints:^(MASConstraintMaker *make) {        make.top.left.right.bottom.offset(15);    }];复制代码