其中leading与left trailing与right 在正常情况下是等价的 但是当一些布局是从右至左时(比如阿拉伯文?没有类似的经验) 则会对调 换句话说就是基本可以不理不用 用left和right就好了。

 

 

七.代码

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

@interface ViewController ()
{
    UIView        *_blackView;
    UIView        *_redView;
    UIView        *_orangeView1;
    UIView        *_orangeView2;
    UIScrollView  *_scrolView;
}
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
   
    [self addBlackView];
   
    //[self addRedView];
   
    //[self addTwoOrangeColorView];
   
    //[self addMoreView];
   
    [self addScrolView];
}
#pragma mark 添加黑色视图
- (void)addBlackView
{
    _blackView = [UIView new];
    _blackView.backgroundColor = [UIColor blackColor];
   
    // 在做autoLayout 之前 一定要先将view添加到superView上， 否则会报错
    [self.view addSubview:_blackView];
  
    //mas_makeConstrains就是Masonry的autoLayout添加函数 将所需的约束添加到block中就行了
    [_blackView mas_makeConstraints:^(MASConstraintMaker *make) {
       
        //居中
        make.center.equalTo(self.view);
      
        //将size设置成(300,300);
        make.size.mas_equalTo(CGSizeMake(300, 300));
    }];
}
#pragma mark 添加红色视图
- (void)addRedView
{
    _redView = [UIView new];
    _redView.backgroundColor = [UIColor redColor];
    [self.view addSubview:_redView];
   
    [_redView mas_makeConstraints:^(MASConstraintMaker *make) {
 
        //这三种方式等价
       

//方式一：
        make.edges.equalTo(_blackView).with.insets(UIEdgeInsetsMake(10, 10, 10, 10));

//方式二：        
//        make.top.equalTo(_blackView).with.offset(10);
//        make.left.equalTo(_blackView).with.offset(10);
//        make.bottom.equalTo(_blackView).with.offset(-10);
//        make.right.equalTo(_blackView).with.offset(-10);

//方式三：
//        make.top.left.bottom.and.right.equalTo(_blackView).with.insets(UIEdgeInsetsMake(10, 10, 10, 10));
    }];
}
#pragma mark 添加俩橘色视图
- (void)addTwoOrangeColorView
{
    //定义边距为10
    int padding1 = 10;
   
    _orangeView1 = [UIView new];
    _orangeView1.backgroundColor = [UIColor orangeColor];
    [self.view addSubview:_orangeView1];
   
    _orangeView2 = [UIView new];
    _orangeView2.backgroundColor = [UIColor orangeColor];
    [self.view addSubview:_orangeView2];
   
    [_orangeView1 mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerY.mas_equalTo(_blackView.mas_centerY);
        make.left.equalTo(_blackView.mas_left).with.offset(padding1);
        make.right.equalTo(_orangeView2.mas_left).with.offset(-padding1);
        make.height.mas_equalTo(@150);
        make.width.equalTo(_orangeView2);
    }];

[_orangeView2 mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerY.mas_equalTo(_blackView.mas_centerY);
        make.left.equalTo(_orangeView1.mas_right).with.offset(padding1);
        make.right.equalTo(_blackView.mas_right).with.offset(-padding1);
        make.height.mas_equalTo(@150);
        make.width.equalTo(_orangeView1);
    }];
}
#pragma mark 添加多个等间距的视图
- (void)addMoreView
{
    UIView *view1 = [[UIView alloc] init];
    view1.backgroundColor = [UIColor redColor];
    [_blackView addSubview:view1];
   
    UIView *view2 = [[UIView alloc] init];
    view2.backgroundColor = [UIColor yellowColor];
    [_blackView addSubview:view2];
   
    UIView *view3 = [[UIView alloc] init];
    view3.backgroundColor = [UIColor greenColor];
    [self.view addSubview:view3];
   
   
    int padding = 10;
   
    [view1 mas_makeConstraints:^(MASConstraintMaker *make) {
        //设置竖直方向约束
        // 设置view1的Y中心点
        make.centerY.mas_equalTo(_blackView);
        // 设置高度
        make.height.mas_equalTo(@150);
       
        //设置水平方向约束
        // 设置左侧距离父视图10
        make.left.equalTo(_blackView).with.offset(padding);
        // 设置右侧距离和view2的左侧相隔10
        make.right.equalTo(view2.mas_left).with.offset(-padding);
        // 宽度设置和view2以及view3相同
        make.width.equalTo(@[view2, view3]);
    }];
   
    [view2 mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerY.mas_equalTo(_blackView);
        make.height.mas_equalTo(view1);
        make.width.equalTo(@[view1, view3]);
    }];
   
    [view3 mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerY.mas_equalTo(_blackView);
        make.left.equalTo(view2.mas_right).with.offset(padding);
        make.right.equalTo(_blackView).with.offset(-padding);
        make.height.mas_equalTo(view1);
        make.width.equalTo(@[view2, view1]);
    }];
}
#pragma mark 添加滑动视图
- (void)addScrolView
{
    _scrolView = [UIScrollView new];
    _scrolView.backgroundColor = [UIColor whiteColor];
    [_blackView addSubview:_scrolView];
    [_scrolView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.edges.equalTo(_blackView).with.insets(UIEdgeInsetsMake(5, 5, 5, 5));
    }];
   
    UIView * container = [UIView new];
    [_scrolView addSubview:container];
    [container mas_makeConstraints:^(MASConstraintMaker *make) {
        make.edges.equalTo(_scrolView);
        make.width.equalTo(_scrolView);
    }];
   
    int count = 10;
    UIView * lastView = nil;
    for (int i = 0; i <= count; i ++)
    {
        UIView * subView = [UIView new];
        [container addSubview:subView];
        subView.backgroundColor = [UIColor colorWithHue:(arc4random() % 156 / 256.0) saturation:(arc4random() % 128 / 256.0) brightness:(arc4random() % 128 / 256.0) alpha:1];
        [subView mas_makeConstraints:^(MASConstraintMaker *make) {
            make.left.and.right.equalTo(container);
            make.height.equalTo(@(20*i));
           
            if (lastView) {
                make.top.mas_equalTo(lastView.mas_bottom);
            }
            else
            {
                make.top.mas_equalTo(container.mas_top);
            }
        }];
        lastView = subView;
    }
    [container mas_makeConstraints:^(MASConstraintMaker *make) {
        make.bottom.equalTo(lastView.mas_bottom);
    }];
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
   
    NSLog(@"_blackView.frame: %@",NSStringFromCGRect(_blackView.frame));
   
    NSLog(@"_blackView1.frame: %@",NSStringFromCGRect(_blackView.frame));
   
    NSLog(@"_orangeView1.frame: %@",NSStringFromCGRect(_orangeView1.frame));
   
    NSLog(@"_orangeView2.frame: %@",NSStringFromCGRect(_orangeView2.frame));
   
    NSLog(@"_scrolView.frame: %@",NSStringFromCGRect(_scrolView.frame));
}

@end