-(void)test1CenterView{        UIView *sv = [UIView new];    sv.backgroundColor = [UIColor grayColor];    //在做autoLayout之前 一定要先将view添加到superview上 否则会报错    [self.view addSubview:sv];    [self.view addSubview:self.btn];    [self.btn mas_makeConstraints:^(MASConstraintMaker *make) {        make.edges.equalTo(sv).with.insets(UIEdgeInsetsMake(10, 10, 10, 10));//btn 间距视图sv 各边界距离//        make.center.mas_equalTo(sv);    }];        //mas_makeConstraints就是Masonry的autolayout添加函数 将所需的约束添加到block中行了    [sv mas_makeConstraints:^(MASConstraintMaker *make) {                //将sv居中        make.center.equalTo(self.view);                //将size设置成(300,300)        make.size.mas_equalTo(CGSizeMake(150, 150));    }];}-(void)action{        [self.btn mas_updateConstraints:^(MASConstraintMaker *make) {        make.size.mas_equalTo(CGSizeMake(50, 50));//点击后更改按钮大小，约束会相应更改父视图的大小    }];    }

-(void)test2Offset{        UIView *sv = [UIView new];    sv.backgroundColor = [UIColor grayColor];    //在做autoLayout之前 一定要先将view添加到superview上 否则会报错    [self.view addSubview:sv];    [self.view addSubview:self.btn];    [self.btn mas_makeConstraints:^(MASConstraintMaker *make) {        make.edges.equalTo(sv).with.insets(UIEdgeInsetsMake(10, 10, 10, 10));//btn 间距视图sv 各边界距离        //        make.center.mas_equalTo(sv);    }];    //mas_makeConstraints就是Masonry的autolayout添加函数 将所需的约束添加到block中行了    [sv mas_makeConstraints:^(MASConstraintMaker *make) {                //将sv居中        make.center.equalTo(self.view);                make.size.mas_equalTo(CGSizeMake(150, 150));    }];            UIView *sv1 = [UIView new];    sv1.backgroundColor = [UIColor greenColor];    [self.view addSubview:sv1];        [sv1 mas_makeConstraints:^(MASConstraintMaker *make) {        make.top.equalTo(sv.mas_bottom).with.offset(10);//底部 10        make.left.equalTo(self.view.mas_left).with.offset(10);//左边 10        make.size.mas_equalTo(CGSizeMake(100, 100));//大小    }];        UIView *sv2 = [UIView new];    sv2.backgroundColor = [UIColor blueColor];    [self.view addSubview:sv2];    [sv2 mas_makeConstraints:^(MASConstraintMaker *make) {        make.bottom.equalTo(sv.mas_top).with.offset(-10);        make.right.equalTo(self.view.mas_right).with.offset(-10);        make.size.mas_equalTo(CGSizeMake(50, 50));    }];}

-(void)testScrollview{    //自动布局设置contentSize    UIScrollView *scrollView = [UIScrollView new];    scrollView.backgroundColor = [UIColor whiteColor];    [self.view addSubview:scrollView];    [scrollView mas_makeConstraints:^(MASConstraintMaker *make) {        make.edges.equalTo(self.view).with.insets(UIEdgeInsetsMake(44,5,5,5));    }];        UIView *container = [UIView new];//中间层 来计算contentSize        [scrollView addSubview:container];    [container mas_makeConstraints:^(MASConstraintMaker *make) {        make.edges.equalTo(scrollView);        make.width.equalTo(scrollView);    }];        int count = 10;        UIView *lastView = nil;        for ( int i = 1 ; i <= count ; ++i )    {        UIView *subv = [UIView new];        [container addSubview:subv];        subv.backgroundColor = [UIColor colorWithHue:( arc4random() % 256 / 256.0 )                                          saturation:( arc4random() % 128 / 256.0 ) + 0.5                                          brightness:( arc4random() % 128 / 256.0 ) + 0.5                                               alpha:1];                [subv mas_makeConstraints:^(MASConstraintMaker *make) {            make.left.and.right.equalTo(container);            make.height.mas_equalTo(@(20*i));                        if ( lastView )            {                make.top.mas_equalTo(lastView.mas_bottom);            }            else            {                make.top.mas_equalTo(container.mas_top);            }        }];                lastView = subv;    }            [container mas_makeConstraints:^(MASConstraintMaker *make) {        make.bottom.equalTo(lastView.mas_bottom);    }];}

通过指示器，可以看到contentSize 已经计算好。

参考文章：http://adad184.com/2014/09/28/use-masonry-to-quick-solve-autolayout/