Masonry 使用介绍

1、Masonry其实就是对系统的Autolayout 进行了封装、大大的提高了开发效率 

2、Masonry用到的是链式编程思想

#import "ViewController.h"
#import <Masonry.h>
@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    UIView *red = [[UIView alloc] init];
    red.backgroundColor = [UIColor redColor];
    [self.view addSubview:red];
    //masonry 内部默认设置了 translatesAutoresizingMaskIntoConstraints
    red.translatesAutoresizingMaskIntoConstraints = NO;
    [red mas_makeConstraints:^(MASConstraintMaker *make) {
// 以下几种写法都一样        1。make.left.mas_equalTo(self.view.mas_left).multipliedBy(1.0).with.offset(20);

//       2 make.left.mas_equalTo(self.view.mas_left).offset(20);
//       3 make.left.mas_equalTo(self.view).offset(20);
//      4  make.left.offset(20);
//       5 make.left.and.top.offset(20);
//        make.left.top.offset(20); and可以省略
//        make.right.mas_equalTo(self.view).offset(-20);
//        make.top.mas_equalTo(self.view).offset(20);
//        make.bottom.mas_equalTo(self.view).offset(-20);

        make.edges.equalTo(self.view).insets(UIEdgeInsetsMake(20, 20, 20, 20));
    }];
    //更新约束
    [red mas_updateConstraints:^(MASConstraintMaker *make) {
        make.bottom.offset(-100);
    }];
    //删除之前的约束 重新设置约束
    [red mas_remakeConstraints:^(MASConstraintMaker *make) {
        
    }];
    // Do any additional setup after loading the view.
}

@end