Masonry — 代码约束

Masonry是一个轻量级的布局框架 拥有自己的描述语法 采用更优雅的链式语法封装自动布局 简洁明了 并具有高可读性 而且同时支持 iOS 和 Max OS X。

Masonry是一个非常优秀的autolayout库 能够节省大量的开发和学习时间

Masonry支持的一些属性

// 左侧
@property (nonatomic, strong, readonly) MASConstraint *left;
// 顶部
@property (nonatomic, strong, readonly) MASConstraint *top;
// 右侧
@property (nonatomic, strong, readonly) MASConstraint *right;
// 底部
@property (nonatomic, strong, readonly) MASConstraint *bottom;
// 首部
@property (nonatomic, strong, readonly) MASConstraint *leading;
// 尾部
@property (nonatomic, strong, readonly) MASConstraint *trailing;
// 宽
@property (nonatomic, strong, readonly) MASConstraint *width;
// 高
@property (nonatomic, strong, readonly) MASConstraint *height;
// 中心点x
@property (nonatomic, strong, readonly) MASConstraint *centerX;
// 中心点y
@property (nonatomic, strong, readonly) MASConstraint *centerY;
// 文本基线
@property (nonatomic, strong, readonly) MASConstraint *baseline;

这些属性与NSLayoutAttrubute的对照表如下

下面是一个Masory工程的Demo

//
//  ViewController.m
//  Masnory_Demo
//
//  Created by lanou3g on 15/10/29.
//  Copyright © 2015年 . All rights reserved.
//

#import "ViewController.h"
#import "Masonry.h"
#import "UIView+masnory.h"


#define WS(weakSelf)  __weak __typeof(&*self)weakSelf = self;

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    WS(ws);
    //从此以后基本可以抛弃CGRectMake了
    UIView *sv = [UIView new];
    sv.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:sv];

    //mas_makeConstraints就是Masonry的autolayout添加函数 将所需的约束添加到block中行了
    [sv mas_makeConstraints:^(MASConstraintMaker *make) {
        //将sv居中
        make.center.equalTo(ws.view);
         //将size设置成(300,300)
        make.size.mas_equalTo(CGSizeMake(300, 300));
    }];

#pragma mark --  [初级] 让一个view略小于其superView(边距为10)

//    
//    UIView *sv1 = [UIView new];
//    sv1.backgroundColor = [UIColor redColor];
//    [sv addSubview:sv1];
//    //距离sv这个视图的边距
//    [sv1 mas_makeConstraints:^(MASConstraintMaker *make) {
//        make.edges.equalTo(sv).with.insets(UIEdgeInsetsMake(10, 10, 10, 10));
//        
//        /* 等价于
//         make.top.equalTo(sv).with.offset(10);
//         make.left.equalTo(sv).with.offset(10);
//         make.bottom.equalTo(sv).with.offset(-10);
//         make.right.equalTo(sv).with.offset(-10);
//         */
//        
//        /* 也等价于
//         make.top.left.bottom.and.right.equalTo(sv).with.insets(UIEdgeInsetsMake(10, 10, 10, 10));
//         */
//    }];

#pragma mark --  [初级]  让两个高度为150的view垂直居中且等宽且等间隔排列 间隔为10(自动计算其宽度)

//    UIView *sv2 = [UIView new];
//    UIView *sv3 = [UIView new];
//    sv2.backgroundColor = [UIColor blueColor];
//    sv3.backgroundColor = [UIColor yellowColor];
//    
//    [sv1 addSubview:sv2];
//    [sv1 addSubview:sv3];
//    
//    int padding1 = 10;
//    [sv2 mas_makeConstraints:^(MASConstraintMaker *make) {
//        make.centerY.mas_equalTo(sv1.mas_centerY);
//        make.left.equalTo(sv1.mas_left).with.offset(padding1);
//        make.right.equalTo(sv3.mas_left).with.offset(-padding1);
//        make.height.mas_equalTo(@150);
//        make.width.equalTo(sv3);
//    }];
//  
//    [sv3 mas_makeConstraints:^(MASConstraintMaker *make) {
//        make.centerY.mas_equalTo(sv1.mas_centerY);
//        make.left.equalTo(sv2.mas_right).with.offset(padding1);
//        make.right.equalTo(sv1.mas_right).with.offset(-padding1);
//        make.height.mas_equalTo(@150);
//     //   make.width.equalTo(sv2);  上面已经写过与其相等
//    }];

#pragma mark -- [中级] 在UIScrollView顺序排列一些view并自动计算contentSize
    UIScrollView *scrollView = [UIScrollView new];
    scrollView.backgroundColor = [UIColor whiteColor];
    [sv addSubview:scrollView];
    [scrollView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.edges.equalTo(sv).with.insets(UIEdgeInsetsMake(5,5,5,5));
    }];
    UIView *container = [UIView new];
    [scrollView addSubview:container];
    [container mas_makeConstraints:^(MASConstraintMaker *make) {
        make.edges.equalTo(scrollView);
        make.width.equalTo(scrollView);
    }];
    int count = 10;
    UIView *lastView = nil;
    for ( int i = 1 ; i <= count ; ++i )
    {
        UIView *subv = [UIView new];
        [container addSubview:subv];
        subv.backgroundColor = [UIColor colorWithHue:( arc4random() % 256 / 256.0 )
                                          saturation:( arc4random() % 128 / 256.0 ) + 0.5
                                          brightness:( arc4random() % 128 / 256.0 ) + 0.5
                                               alpha:1];

        [subv mas_makeConstraints:^(MASConstraintMaker *make) {
            make.left.and.right.equalTo(container);
            make.height.mas_equalTo(@(20*i));

            if ( lastView )
            {
                make.top.mas_equalTo(lastView.mas_bottom);
            }
            else
            {
                make.top.mas_equalTo(container.mas_top);
            }
        }];

        lastView = subv;
    }
    [container mas_makeConstraints:^(MASConstraintMaker *make) {
        make.bottom.equalTo(lastView.mas_bottom);
    }];

#pragma mark --  [高级] 横向或者纵向等间隙的排列一组view

    UIView *sv11 = [UIView new];
    UIView *sv12 = [UIView new];
    UIView *sv13 = [UIView new];
    UIView *sv21 = [UIView new];
    UIView *sv31 = [UIView new];
    sv11.backgroundColor = [UIColor blackColor];
    sv12.backgroundColor = [UIColor blackColor];
    sv13.backgroundColor = [UIColor blackColor];
    sv21.backgroundColor = [UIColor blackColor];
    sv31.backgroundColor = [UIColor blackColor];
    [sv addSubview:sv11];
    [sv addSubview:sv12];
    [sv addSubview:sv13];
    [sv addSubview:sv21];
    [sv addSubview:sv31];
    //给予不同的大小 测试效果
    [sv11 mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerY.equalTo(@[sv12,sv13]);
        make.centerX.equalTo(@[sv21,sv31]);
        make.size.mas_equalTo(CGSizeMake(40, 40));
    }];
    [sv12 mas_makeConstraints:^(MASConstraintMaker *make) {
        make.size.mas_equalTo(CGSizeMake(70, 20));
    }];
    [sv13 mas_makeConstraints:^(MASConstraintMaker *make) {
        make.size.mas_equalTo(CGSizeMake(50, 50));
    }];
    [sv21 mas_makeConstraints:^(MASConstraintMaker *make) {
        make.size.mas_equalTo(CGSizeMake(50, 20));
    }];
    [sv31 mas_makeConstraints:^(MASConstraintMaker *make) {
        make.size.mas_equalTo(CGSizeMake(40, 60));
    }];
    [sv distributeSpacingHorizontallyWith:@[sv11,sv12,sv13]];
    [sv distributeSpacingVerticallyWith:@[sv11,sv21,sv31]];

}

@end

使用方法http://www.cocoachina.com/ios/20141219/10702.html