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

在SQL Server里禁用聚集索引——真的好么？
有人问了我一个最有意思的问题:“你能禁用聚集索引么?” 对这个问题,我先是吓了一跳,因为我从未想过禁用聚集索引,因为聚集索引代表表数据,对这个最有趣问题,我立即答道:“我认为可以,但是...” 好吧, ...
php的memcache和memcached扩展区别
老生长谈的问题了.我这里就整理一下. memcache的文档在:http://pecl.php.net/package/memcache memcached的文档在:http://pecl.php.n ...
这些HTML、CSS知识点，面试和平时开发都需要 No8-No9
系列知识点汇总这些HTML.CSS知识点,面试和平时开发都需要 No1-No4(知识点:HTML.CSS.盒子模型.内容布局) 这些HTML.CSS知识点,面试和平时开发都需要 No5-No7(知识 ...
vue之watch用法
对应一个对象,键是观察表达式,值是对应回调.值也可以是方法名,或者是对象,包含选项.在实例化时为每个键调用 $watch() ; //使用官方vue-cli脚手架书写<template> ...
【原创】kafka controller源代码分析(一)
Kafka集群中的一个broker会被作为controller负责管理分区和副本的状态以及执行类似于重分配分区之类的管理任务.如果当前的controller失败了,会从剩下的broker中选出新的co ...
【转】同一台Windows机器中启动多个Memcached服务
上一篇介绍了Memcached的安装,但是如果手头上只有一台机器,又想做多节点测试咋办? 这就需要在一台机器上启动多个Memcached服务了. 假设Memcached在如下目录:C:\memcach ...
SSH实例(7)
运行结果. 浏览课程: 添加课程: 还有删除课程,这里就不演示了.
spring的事务操作
我们项目一期已经差不多结束了,所以一些细节也被拿了出来,出现最多的就是事务的操作了.因为自己负责的是一个模块(因为是另外一个项目的负责人),所以组员经常会遇到事务的问题,会出现很多奇葩的用法,各种乱用 ...
使用maven创建Archetype
Archetype原型也就是说为项目生成一个原型,可以把这个项目发布,其他人就可以直接通过命令构建一个原型项目了. 其实我一开始也是不知道maven还有这个功能的,但是在使用的springside的 ...
Gym 100703G---Game of numbers（DP）
题目链接 http://vjudge.net/contest/132391#problem/G Description standard input/outputStatements — It' s ...

Layout--iOS

Layout--iOS的更多相关文章

随机推荐

热门专题