Masonry

#import "twoViewController.h"
#import "Masonry.h"

@interface twoViewController ()

@end

@implementation twoViewController

/**
 *  案例
 
 要求：
 
 无论在什么尺寸的设备上（包括横竖屏切换），黑色view的左、上边距、大小都不变；
 灰色view的右边距不变
 宽、高、上边距黑色view相等
 */


- (void)viewDidLoad {
    [super viewDidLoad];
    
    UIView *blackView = [UIView new];
    blackView.backgroundColor = [UIColor blackColor];
    [self.view addSubview:blackView];
    
    // 防止block中的循环调用
    __weak typeof(self) weakSelf = self;
    // 给黑色view添加约束
    [blackView mas_makeConstraints:^(MASConstraintMaker *make) {
        
        // 添加大小约束
        make.size.mas_equalTo(CGSizeMake(100, 200));
        
        // 添加左、上边距约束
        make.left.and.top.mas_equalTo(weakSelf).with.offset(20);
        
    }];
    
    // 初始化绿色view
    UIView *greenView = [UIView new];
    greenView.backgroundColor = [UIColor greenColor];
    [self.view addSubview:greenView];
    
    // 给绿色view添加约束
    [greenView mas_makeConstraints:^(MASConstraintMaker *make) {
        
        // 大小和上边距约束与黑色view相同
        make.size.and.top.equalTo(blackView);
        
        // 添加右边距约束
        make.right.mas_equalTo(weakSelf).with.offset(-20);
        
    }];
    
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    
}



@end