Masonry的使用1

#import "ViewController.h"
#import "Masonry.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    // 1.创建控件
    UIView *blueView = [[UIView alloc] init];
    blueView.backgroundColor = [UIColor blueColor];
    [self.view addSubview:blueView];
    
    // 2.添加约束
    //尺寸：100x100
    //位置：父控件右下角，间距20
    [blueView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.width.height.equalTo(@100);
        make.right.equalTo(self.view.mas_right).offset(-20);
        make.bottom.equalTo(self.view.mas_bottom).offset(-20);
    }];
    

}

/*
 //这个方法会将以前的所有约束删掉，添加新的约束
 [blueView mas_remakeConstraints:^(MASConstraintMaker *make) {
 
 }];
 
 //这个方法将会覆盖以前的某些约束
 [blueView mas_updateConstraints:^(MASConstraintMaker *make) {
 
 }];
 */
@end

代码优化：

    [blueView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.width.height.mas_equalTo(100);
        make.right.bottom.equalTo(self.view).offset(-20);
    }];

继续优化：

    [blueView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.size.mas_equalTo(CGSizeMake(100, 100));
        make.right.bottom.mas_equalTo(self.view).offset(-20);
    }];