Layout--iOS

// 系统的约束代码

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    UIView *superView = self.view;

    UIView *viewDemo = [[UIView alloc] init];

    viewDemo.translatesAutoresizingMaskIntoConstraints = NO;

    viewDemo.backgroundColor = [UIColor orangeColor];

    [superView addSubview:viewDemo];

    UIEdgeInsets padding = UIEdgeInsetsMake(, , , );

    [superView addConstraints:@[

　　　　　　　　　　　// viewDemo顶部距离父视图superView顶部距离为padding.top(即为：10)，

                               [NSLayoutConstraint constraintWithItem:viewDemo attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:superView attribute:NSLayoutAttributeTop multiplier: constant:padding.top],

                               [NSLayoutConstraint constraintWithItem:viewDemo attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationEqual toItem:superView attribute:NSLayoutAttributeLeft multiplier: constant:padding.left],

                               [NSLayoutConstraint constraintWithItem:viewDemo attribute:NSLayoutAttributeRight relatedBy:NSLayoutRelationEqual toItem:superView attribute:NSLayoutAttributeRight multiplier: constant:-padding.right],

                               [NSLayoutConstraint constraintWithItem:viewDemo attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:superView attribute:NSLayoutAttributeBottom multiplier: constant:-padding.bottom]

                               ]];

}

// 注：若是把右边约束去掉，改为如下语句

// [NSLayoutConstraint constraintWithItem:viewDemo attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:superView attribute:NSLayoutAttributeWidth multiplier:0.5 constant:0]

// 则viewDemo的宽度变为superView的0.5倍！！

//***************************************************

// VFL语言

　 UIView *viewLeft = [[UIView alloc] init];

    viewLeft.translatesAutoresizingMaskIntoConstraints = NO;

    viewLeft.backgroundColor = [UIColor orangeColor];

    [self.view addSubview:viewLeft];

    UIView *viewRight = [[UIView alloc] init];

    viewRight.translatesAutoresizingMaskIntoConstraints = NO;

    viewRight.backgroundColor = [UIColor redColor];

    [self.view addSubview:viewRight];

    // horizontal：水平方向距左边10，距右边10

    //简单说来，NSDictionaryOfVariableBindings(scrollView)就等于@{@”scrollView”: scrollView}

    NSDictionary *constraintDict = NSDictionaryOfVariableBindings(viewLeft,viewRight);

    NSArray *hConstraintArrayLeft = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-(10)-[viewLeft]-(10)-|" options: metrics:nil views:constraintDict];

    // vertical： 垂直方向距顶部30，控件高度100

    NSArray *vConstraintArrayLeft = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-(30)-[viewLeft(100)]" options: metrics:nil views:constraintDict];

    // 添加到父视图上

    [self.view addConstraints:hConstraintArrayLeft];

    [self.view addConstraints:vConstraintArrayLeft];

    NSArray *hConstraintArrayRight = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-(10)-[viewRight]-(10)-|" options: metrics:nil views:constraintDict];

    // viewRight距viewLeft的垂直距离为50

    NSArray *vConstraintArrayRight = [NSLayoutConstraint constraintsWithVisualFormat:@"V:[viewLeft]-(50)-[viewRight(200)]" options: metrics:nil views:constraintDict];

    [self.view addConstraints:hConstraintArrayRight];

    [self.view addConstraints:vConstraintArrayRight];

//***************************************************

// 三方库：Masonry

// 居中

// 快速定义一个weakSelf，用于block里面，防止循环引用

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

WS(ws);

UIView *sv = [UIView new];

sv.backgroundColor = [UIColor orangeColor];

// 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];

[sv mas_makeConstraints:^(MASConstraintMaker *make) {

// 居中

make.center.equalTo(ws.view);

// 设置size

make.size.mas_equalTo(CGSizeMake(300, 300));

}];

3. [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)

int padding1 = 10;

[sv2 mas_makeConstraints:^(MASConstraintMaker *make) {

make.centerY.mas_equalTo(sv.mas_centerY);

make.left.equalTo(sv.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(sv.mas_centerY);

make.left.equalTo(sv2.mas_right).with.offset(padding1);

make.right.equalTo(sv.mas_right).with.offset(-padding1);

make.height.mas_equalTo(@150);

make.width.equalTo(sv2);

}];

代码效果

这里我们在两个子view之间互相设置的约束可以看到他们的宽度在约束下自动的被计算出来了

4. [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);

}];

头部效果

尾部效果

从scrollView的scrollIndicator可以看出 scrollView的内部已如我们所想排列好了

这里的关键就在于container这个view起到了一个中间层的作用能够自动的计算uiscrollView的contentSize

5. [高级] 横向或者纵向等间隙的排列一组view

很遗憾 autoLayout并没有直接提供等间隙排列的方法(Masonry的官方demo中也没有对应的案例) 但是参考案例3 我们可以通过一个小技巧来实现这个目的为此我写了一个Category

@implementation UIView(Masonry_LJC)

- (void) distributeSpacingHorizontallyWith:(NSArray*)views

{

NSMutableArray *spaces = [NSMutableArray arrayWithCapacity:views.count+1];

for ( int i = 0 ; i < views.count+1 ; ++i )

{

UIView *v = [UIView new];

[spaces addObject:v];

[self addSubview:v];

[v mas_makeConstraints:^(MASConstraintMaker *make) {

make.width.equalTo(v.mas_height);

}];

}

UIView *v0 = spaces[0];

__weak __typeof(&*self)ws = self;

[v0 mas_makeConstraints:^(MASConstraintMaker *make) {

make.left.equalTo(ws.mas_left);

make.centerY.equalTo(((UIView*)views[0]).mas_centerY);

}];

UIView *lastSpace = v0;

for ( int i = 0 ; i < views.count; ++i )

{

UIView *obj = views[i];

UIView *space = spaces[i+1];

[obj mas_makeConstraints:^(MASConstraintMaker *make) {

make.left.equalTo(lastSpace.mas_right);

}];

[space mas_makeConstraints:^(MASConstraintMaker *make) {

make.left.equalTo(obj.mas_right);

make.centerY.equalTo(obj.mas_centerY);

make.width.equalTo(v0);

}];

lastSpace = space;

}

[lastSpace mas_makeConstraints:^(MASConstraintMaker *make) {

make.right.equalTo(ws.mas_right);

}];

}

- (void) distributeSpacingVerticallyWith:(NSArray*)views

{

NSMutableArray *spaces = [NSMutableArray arrayWithCapacity:views.count+1];

for ( int i = 0 ; i < views.count+1 ; ++i )

{

UIView *v = [UIView new];

[spaces addObject:v];

[self addSubview:v];

[v mas_makeConstraints:^(MASConstraintMaker *make) {

make.width.equalTo(v.mas_height);

}];

}

UIView *v0 = spaces[0];

__weak __typeof(&*self)ws = self;

[v0 mas_makeConstraints:^(MASConstraintMaker *make) {

make.top.equalTo(ws.mas_top);

make.centerX.equalTo(((UIView*)views[0]).mas_centerX);

}];

UIView *lastSpace = v0;

for ( int i = 0 ; i < views.count; ++i )

{

UIView *obj = views[i];

UIView *space = spaces[i+1];

[obj mas_makeConstraints:^(MASConstraintMaker *make) {

make.top.equalTo(lastSpace.mas_bottom);

}];

[space mas_makeConstraints:^(MASConstraintMaker *make) {

make.top.equalTo(obj.mas_bottom);

make.centerX.equalTo(obj.mas_centerX);

make.height.equalTo(v0);

}];

lastSpace = space;

}

[lastSpace mas_makeConstraints:^(MASConstraintMaker *make) {

make.bottom.equalTo(ws.mas_bottom);

}];

}

@end

简单的来测试一下

UIView *sv11 = [UIView new];

UIView *sv12 = [UIView new];

UIView *sv13 = [UIView new];

UIView *sv21 = [UIView new];

UIView *sv31 = [UIView new];

sv11.backgroundColor = [UIColor redColor];

sv12.backgroundColor = [UIColor redColor];

sv13.backgroundColor = [UIColor redColor];

sv21.backgroundColor = [UIColor redColor];

sv31.backgroundColor = [UIColor redColor];

[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]];

[sv showPlaceHolderWithAllSubviews];

[sv hidePlaceHolder];

代码效果

perfect! 简洁明了的达到了我们所要的效果

这里所用的技巧就是使用空白的占位view来填充我们目标view的旁边这点通过图上的空白标注可以看出来

引自：http://www.cocoachina.com/ios/20141219/10702.html

若有侵权，请告知

Layout--iOS的更多相关文章

Interface Builder: What are the UIView's Layout iOS 6/7 Deltas for?
up vote57down votefavorite 19 I just noticed the iOS 6/7 Delta property found under the UIView's str ...
iOS Programming Auto Layout: Programmatic Constraints 自动布局：通过编程限制
iOS Programming Auto Layout: Programmatic Constraints 1. However, if your views are created in co ...
[Android开发学iOS系列] Auto Layout
[Android开发学iOS系列] Auto Layout 内容: 介绍什么是Auto Layout. 基本使用方法在代码中写约束的方法 Auto Layout的原理尺寸和优先级 Auto Lay ...
iOS 强大第三方资源库
Github用法 git-recipesGit recipes in Chinese. 高质量的Git中文教程. lark怎样在Github上面贡献代码 my-git有关 git 的学习资料 giti ...
iOS 第三方库、插件、知名博客总结
iOS 第三方库.插件.知名博客总结用到的组件 1.通过CocoaPods安装项目名称项目信息 AFNetworking 网络请求组件 FMDB 本地数据库组件 SDWebImage 多个缩略图 ...
AutoLayout ＋Masonary
1, Masonry介绍与使用实践(快速上手Autolayout) http://adad184.com/2014/09/28/use-masonry-to-quick-solve-autolayou ...
Topics
Topics Introduction (starting with old devices) How to handle a new Firmware How to set up your Mac ...
iOS 8 Auto Layout界面自动布局系列2-使用Xcode的Interface Builder添加布局约束
http://blog.csdn.net/pucker/article/details/41843511 上一篇文章<iOS 8界面自动布局系列-1>简要介绍了iOS界面布局方式的前世今生 ...
The Layout Process on Mac OSX and iOS
First we will recap the steps it takes to bring views on screen with Auto Layout enabled. When you’r ...
ios auto layout demystified (一)
Ambiguous Layout 在开发过程中,你可以通过调用hasAmbiguousLayout 来测试你的view约束是否足够的.这个会返回boolean值.如果有一个不同的frame就会返回ye ...

随机推荐

Hyperledger中数据存取的实现
简介本文介绍了在Hyperledger中数据存取的实现. API接口 Hyperledger提供基于key/value的数据存储,其中key是字符串,value则是二进制字节数组,Hyperledg ...
nginx+uwsgi+django+celery+supervisord环境部署
前言很久没更博客了,最近新写了一个小项目,后边有时间把一些心得放上来,先把环境的部署方式整理出来. 部署过程先将环境的python升级为2.7 保证有pip 安装了nginx并配置 vim /Da ...
Moon.Orm 5.0(MQL版)分页功能的设计(求指教,邀请您的加入)
一.分页的分类及分析 1)分页的前置条件: 查询的目标条件.第几页.总页数(本质上由查询条件决定).每页条数.请求地址.按照什么字段怎样排序 2)目标结果: 数据列表,List<T>返回 ...
选择排序---堆排序算法（Javascript版）
堆排序分为两个过程: 1.建堆. 堆实质上是完全二叉树,必须满足:树中任一非叶子结点的关键字均不大于(或不小于)其左右孩子(若存在)结点的关键字. 堆分为:大根堆和小根堆,升序排序采用大根堆,降序排序 ...
现在就使用HTML5的十大原因
你难道还没有考虑使用HTML5? 当然我猜想你可能有自己的原因: 它现在还没有被广泛的支持,在IE中不好使,或者你就是喜欢写比较严格的XHTML代码. HTML5是Web开发世界的一次重大的改变,事实 ...
PHP类和对象等代码说明
1.定义和创建类和对象: 定义类要使用class关键字.例如:class 类名{//属性和方法} 创建对象使用new关键字.例如: $p1 = new 类名;,可以基于一个类创建多个对象. 2. 类属 ...
BaseAdapter的getView()方法
getView()是BaseAdapter的一个重要方法.为了研究getView()方法,使用了以下的类. // apk列表 class list_apk extends BaseAdapter{ p ...
luogg_java学习_01_JAVA基本概述
本文为博主辛苦总结,希望自己以后返回来看的时候理解更深刻,也希望可以起到帮助初学者的作用. 转载请注明出自 : luogg的博客园谢谢配合! 1.1基础常识常用的dos命令 dir 列出当前目录 ...
Hack语言特性之类型化
Hack最基础的特性就是类型标注.PHP5已经开始支持对象的类型化,PHP7也提供了标量类型化声明.Hack提供了全面的类型标注支持,与其typecher配合使用,还可以实现快速.前置静态类型验证. ...
RecyclerView和PullToRefreshListView的对比
项目中上拉刷新和下拉加载一直都是比较常见的:以前一般都是重写ListView或直接用PullToRefreshListView的框架:最近尝试用RecyclerView来实现下拉加载上拉刷新也是不错的 ...

Layout--iOS

Layout--iOS的更多相关文章

随机推荐

热门专题