/// 左侧
@property (nonatomic, strong, readonly) MASConstraint *left;
/// 上侧
@property (nonatomic, strong, readonly) MASConstraint *top;
/// 右侧
@property (nonatomic, strong, readonly) MASConstraint *right;
/// 下侧
@property (nonatomic, strong, readonly) MASConstraint *bottom;
/// 首部
@property (nonatomic, strong, readonly) MASConstraint *leading;
/// 底部
@property (nonatomic, strong, readonly) MASConstraint *trailing;
/// 宽
@property (nonatomic, strong, readonly) MASConstraint *width;
/// 高
@property (nonatomic, strong, readonly) MASConstraint *height;
/// 横向中点
@property (nonatomic, strong, readonly) MASConstraint *centerX;
/// 纵向中点
@property (nonatomic, strong, readonly) MASConstraint *centerY;
/// 文本基线
@property (nonatomic, strong, readonly) MASConstraint *baseline;// 在Masonry的源码中我们可以看到他们对应的NSLayoutAttribute的属性对应如下
- (MASConstraint *)left {return [self addConstraintWithLayoutAttribute:NSLayoutAttributeLeft];
}- (MASConstraint *)top {return [self addConstraintWithLayoutAttribute:NSLayoutAttributeTop];
}- (MASConstraint *)right {return [self addConstraintWithLayoutAttribute:NSLayoutAttributeRight];
}- (MASConstraint *)bottom {return [self addConstraintWithLayoutAttribute:NSLayoutAttributeBottom];
}- (MASConstraint *)leading {return [self addConstraintWithLayoutAttribute:NSLayoutAttributeLeading];
}- (MASConstraint *)trailing {return [self addConstraintWithLayoutAttribute:NSLayoutAttributeTrailing];
}- (MASConstraint *)width {return [self addConstraintWithLayoutAttribute:NSLayoutAttributeWidth];
}- (MASConstraint *)height {return [self addConstraintWithLayoutAttribute:NSLayoutAttributeHeight];
}- (MASConstraint *)centerX {return [self addConstraintWithLayoutAttribute:NSLayoutAttributeCenterX];
}- (MASConstraint *)centerY {return [self addConstraintWithLayoutAttribute:NSLayoutAttributeCenterY];
}- (MASConstraint *)baseline {return [self addConstraintWithLayoutAttribute:NSLayoutAttributeBaseline];
}

/// 距离边框的距离，等同于选中Storyboard的Constrain to margins后加约束
@property (nonatomic, strong, readonly) MASConstraint *leftMargin;
@property (nonatomic, strong, readonly) MASConstraint *rightMargin;
@property (nonatomic, strong, readonly) MASConstraint *topMargin;
@property (nonatomic, strong, readonly) MASConstraint *bottomMargin;
@property (nonatomic, strong, readonly) MASConstraint *leadingMargin;
@property (nonatomic, strong, readonly) MASConstraint *trailingMargin;
@property (nonatomic, strong, readonly) MASConstraint *centerXWithinMargins;
@property (nonatomic, strong, readonly) MASConstraint *centerYWithinMargins;- (MASConstraint *)leftMargin {return [self addConstraintWithLayoutAttribute:NSLayoutAttributeLeftMargin];
}- (MASConstraint *)rightMargin {return [self addConstraintWithLayoutAttribute:NSLayoutAttributeRightMargin];
}- (MASConstraint *)topMargin {return [self addConstraintWithLayoutAttribute:NSLayoutAttributeTopMargin];
}- (MASConstraint *)bottomMargin {return [self addConstraintWithLayoutAttribute:NSLayoutAttributeBottomMargin];
}- (MASConstraint *)leadingMargin {return [self addConstraintWithLayoutAttribute:NSLayoutAttributeLeadingMargin];
}- (MASConstraint *)trailingMargin {return [self addConstraintWithLayoutAttribute:NSLayoutAttributeTrailingMargin];
}- (MASConstraint *)centerXWithinMargins {return [self addConstraintWithLayoutAttribute:NSLayoutAttributeCenterXWithinMargins];
}

#import "RootViewController.h"
// 引入头文件
#import "Masonry.h"
@interface RootViewController ()@end@implementation RootViewController- (void)viewDidLoad {[super viewDidLoad];// Do any additional setup after loading the view.#pragma mark label// 添加约束，不需要设置frameUILabel *label = [UILabel new];label.backgroundColor = [UIColor redColor];// 添加父视图，视图添加完成后才能进行布局
    [self.view addSubview:label];// 布局实现label方法[label mas_makeConstraints:^(MASConstraintMaker *make) {// 距离上边50// make：相当于你要布局的视图// equalTo（参照视图对象），如果参照视图是self.view,可以不设置参照视图的属性// offset（距离数值）make.top.equalTo(self.view).offset(50);// 距离左边100make.left.equalTo(self.view).offset(100);// 距离右边100make.right.equalTo(self.view).offset(-100);// 距离下边500make.bottom.equalTo(self.view).offset(-500);}];
#pragma mark label1UILabel *label1 = [UILabel new];label1.backgroundColor = [UIColor greenColor];[self.view addSubview:label1];// 布局实现label1方法// 先布局参照视图，否则约束容易丢失[label1 mas_makeConstraints:^(MASConstraintMaker *make) {// equalTo（自定义视图），需要设置视图的属性// 如果数值为0，可以不写offset（）make.top.equalTo(label.mas_bottom).offset(50);make.leading.equalTo(label.mas_leading);make.trailing.equalTo(label.mas_trailing);// 高度60// mas_equalTo(数值)make.height.mas_equalTo(60);}];#pragma mark label2UILabel *label2 = [UILabel new];label2.backgroundColor = [UIColor grayColor];[self.view addSubview:label2];// 设置距离参照视图的内边距 （上左下右）UIEdgeInsets padding = UIEdgeInsetsMake(400, 100, 100, 100);// 布局实现label2方法// 先布局参照视图，否则约束容易丢失[label2 mas_makeConstraints:^(MASConstraintMaker *make) {// 设置约束视图的边界距离self.view的边界值
        make.edges.equalTo(self.view).insets(padding);//        make.top.equalTo(self.view).offset(400);
//        make.left.equalTo(self.view).offset(100);
//        make.right.equalTo(self.view).offset(-100);
//
//        make.bottom.equalTo(self.view).offset(-100);
        }];
#pragma mark label3UILabel *label3 = [UILabel new];label3.backgroundColor = [UIColor orangeColor];[self.view addSubview:label3];[label3 mas_makeConstraints:^(MASConstraintMaker *make) {// 设置中心点一致
        make.center.equalTo(label2);// 设置大小// make.width = label2.width - 40// make.heigth = label2.height - 60make.size.equalTo(label2).sizeOffset(CGSizeMake(-40, -60));}];}@end