Masonry适配——UIScrollView的设置
当使用masonry时，无法通过CGSizeMake进行设置它的contentSize，所以需要通过一个过渡视图进行处理。即scrollView作为父视图，添加子视图，即过渡视图A，然后再将其他真正需要添加到scrollView上的子视图a、b、c等添加到过渡视图A中，然后再将a、b、c等中的最后一个子视图的右边距，或底边距设置成过渡视图A的右边距，或底边距，以此来设置scrollView的contentSize在水平方向，或垂直方向的大小
代码示例：
水平方向
UIScrollView *horizontalScrollView = [[UIScrollViewalloc]init];
horizontalScrollView.backgroundColor = [UIColororangeColor];
horizontalScrollView.pagingEnabled =YES;
// 添加scrollView添加到父视图，并设置其约束
[self.viewaddSubview:horizontalScrollView];
[horizontalScrollView mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.and.left.mas_equalTo(10);
make.right.mas_equalTo(-10);
make.height.mas_equalTo(100);
}];
// 设置scrollView的子视图，即过渡视图contentSize，并设置其约束
UIView *horizontalContainerView = [[UIViewalloc]init];
[horizontalScrollView addSubview:horizontalContainerView];
[horizontalContainerView mas_makeConstraints:^(MASConstraintMaker *make) {
make.edges.equalTo(horizontalScrollView);
make.height.equalTo(horizontalScrollView);
}];
//过渡视图添加子视图
UIView *previousView =nil;
for (int i =0; i <10; i++)
{
UILabel *label = [[UILabelalloc]init];
label.textAlignment =NSTextAlignmentCenter;
label.backgroundColor = [UIColorcolorWithHue:(arc4random() %256 / 256.0)
saturation:(arc4random() %128 /256.0) +0.5
brightness:(arc4random() %128 /256.0) +0.5
alpha:1];
label.text = [NSStringstringWithFormat:@"第 %d个视图", i];
//添加到父视图，并设置过渡视图中子视图的约束
[horizontalContainerView addSubview:label];
[label mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.and.bottom.equalTo(horizontalContainerView);
make.width.equalTo(horizontalScrollView);
if (previousView)
{
make.left.mas_equalTo(previousView.mas_right);
}
else
{
make.left.mas_equalTo(0);
}
}];
previousView = label;
}
// 设置过渡视图的右距（此设置将影响到scrollView的contentSize）
[horizontalContainerView mas_makeConstraints:^(MASConstraintMaker *make) {
make.right.mas_equalTo(previousView.mas_right);
}];
==================================================================
垂直方向
UIScrollView *verticalScrollView = [[UIScrollViewalloc]init];
verticalScrollView.backgroundColor = [UIColorgreenColor];
verticalScrollView.pagingEnabled =YES;
// 添加scrollView添加到父视图，并设置其约束
[self.viewaddSubview:verticalScrollView];
[verticalScrollView mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.mas_equalTo(10);
make.bottom.and.right.mas_equalTo(-10.0);
make.height.mas_equalTo(100);
}];
// 设置scrollView的子视图，即过渡视图contentSize，并设置其约束
UIView *verticalContainerView = [[UIViewalloc]init];
[verticalScrollView addSubview:verticalContainerView];
[verticalContainerView mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.left.bottom.and.right.equalTo(verticalScrollView).with.insets(UIEdgeInsetsZero);
make.width.equalTo(verticalScrollView);
}];
//过渡视图添加子视图
UIView *lastView =nil;
for (NSInteger index =0; index <10; index++)
{
UILabel *label = [[UILabelalloc]init];
label.textAlignment =NSTextAlignmentCenter;
label.backgroundColor = [UIColorcolorWithHue:(arc4random() %256 / 256.0)
saturation:(arc4random() %128 /256.0) +0.5
brightness:(arc4random() %128 /256.0) +0.5
alpha:1];
label.text = [NSStringstringWithFormat:@"第 %ld个视图", index];
//添加到父视图，并设置过渡视图中子视图的约束
[verticalContainerView addSubview:label];
[label mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.and.right.equalTo(verticalContainerView);
make.height.mas_equalTo(verticalScrollView.mas_height);
if (lastView)
{
make.top.mas_equalTo(lastView.mas_bottom);
}
else
{
make.top.mas_equalTo(0);
}
}];
lastView = label;
}
// 设置过渡视图的底边距（此设置将影响到scrollView的contentSize）
[verticalContainerView mas_makeConstraints:^(MASConstraintMaker *make) {
make.bottom.equalTo(lastView.mas_bottom);
}];
