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这个现在已经广泛使用了嘛!
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Auto Layout builds constraints in three ways. So far, you’ve read about two of them. First, you can lay out your constraints in Interface Builder(IB) and customize them to your needs.Second, you can build single constraints in code. The NSLayoutConstraint class offers the constraintWithItem:attribute:relatedBy:toItem:attribute:multiplier:constant: method, which enables you to create constraints one at a time, relating one item’s attribute to another. In this chapter, you’ll read about the third way: using a visual formatting language to express how items are laid out along vertical and horizontal axes.
This chapter explores what these visual constraints look like, how you build them, and how you use them in your projects. You’ll read about how metrics dictionaries and constraint options extend visual formats for more flexibility. And you’ll see numerous examples that demonstrate these formats and explore the results they create.
There’s one thing to keep in mind throughout: All constraints are members of the NSLayoutConstraint class, regardless of how you build them. Every constraint stores a “y relation mx +b” rule within an Objective-C object and expresses that rule through the Auto Layout engine. Visual formats are another tool that takes you to that same place.
使用IB,代码写的NSLayoutConstraint,还有Visual formats转化的NSLayoutConstraint.
Layout constraints (NSLayoutConstraint class, public)
These rules specify view geometry. They restrict a view’s position and size by relating a view to other views and / or to constant values.
Content size constraints(NSContentSizeLayoutConstraint class, private)
Content size rules specify how a view’s size should relate to its content. For example, content hugging rules avoid adding padding, and content compression rules prevent clipping.
Autosizing constraints (NSAutoresizingMaskLayoutConstraint class, private)
Autosizing constraints translate the older autosizing masks into the Auto Layout system.
Layout support constraints (_UILayoutSupportConstraint class, private)
Introduced in iOS7, layout support constraints establish practical boundaries for the tops and bottoms of your view controller instances. These constraints restrict content from overlapping with obstacles such as status bars.
Prototyping constraints (NSIBPrototypingLayoutConstraint class, private)
Also new to iOS 7, prototyping constraints are constraints that Interface Builder(IB) adds for you. They enable you to build interfaces incrementally yet still have a working interface to test. When you ship apps, your code should not use, reference, or otherwise include prototyping constraints.
In IB, you create layout support constraints by constraining views to top or bottom layout guide proxies.
UIView *topLayoutGuide = (UIView *)self.topLayoutGuide;
CONSTRAIN(@”V:[topLayoutGuide][textView]|”, topLayoutGuie, textView);
In this example, a text view stretches between the top guide, which defines the top of the application context space, and the bottom of the parent.
This chapter explores what these visual constraints look like, how you build them, and how you use them in your projects. You’ll read about how metrics dictionaries and constraint options extend visual formats for more flexibility. And you’ll see numerous examples that demonstrate these formats and explore the results they create.
There’s one thing to keep in mind throughout: All constraints are members of the NSLayoutConstraint class, regardless of how you build them. Every constraint stores a “y relation mx +b” rule within an Objective-C object and expresses that rule through the Auto Layout engine. Visual formats are another tool that takes you to that same place.
使用IB,代码写的NSLayoutConstraint,还有Visual formats转化的NSLayoutConstraint.
Layout constraints (NSLayoutConstraint class, public)
These rules specify view geometry. They restrict a view’s position and size by relating a view to other views and / or to constant values.
Content size constraints(NSContentSizeLayoutConstraint class, private)
Content size rules specify how a view’s size should relate to its content. For example, content hugging rules avoid adding padding, and content compression rules prevent clipping.
Autosizing constraints (NSAutoresizingMaskLayoutConstraint class, private)
Autosizing constraints translate the older autosizing masks into the Auto Layout system.
Layout support constraints (_UILayoutSupportConstraint class, private)
Introduced in iOS7, layout support constraints establish practical boundaries for the tops and bottoms of your view controller instances. These constraints restrict content from overlapping with obstacles such as status bars.
Prototyping constraints (NSIBPrototypingLayoutConstraint class, private)
Also new to iOS 7, prototyping constraints are constraints that Interface Builder(IB) adds for you. They enable you to build interfaces incrementally yet still have a working interface to test. When you ship apps, your code should not use, reference, or otherwise include prototyping constraints.
In IB, you create layout support constraints by constraining views to top or bottom layout guide proxies.
UIView *topLayoutGuide = (UIView *)self.topLayoutGuide;
CONSTRAIN(@”V:[topLayoutGuide][textView]|”, topLayoutGuie, textView);
In this example, a text view stretches between the top guide, which defines the top of the application context space, and the bottom of the parent.
发表评论
-
UIImage变为NSData并进行压缩
2014-05-19 20:23 1879//sdk中提供了方法可以直接调用 UIImage *im ... -
update cocapods
2014-05-17 22:27 773早上更新cocoapod依赖库,发现更新到32.1版本,早先的 ... -
iOS发送短信息代码实例
2014-05-16 18:15 2635#import <MessageUI/Message ... -
DISPATCH TIMER
2014-05-14 16:12 680/* __block void (^callback) ... -
UITextField左边显示图片
2014-05-13 18:08 1115The overlay view displayed on t ... -
iOS调用系统打电话,发短信功能
2014-05-11 15:48 2061先介绍一种最简单的方法: 调用打电话功能 [[UIAppl ... -
iOS面试题
2014-05-09 16:10 10491.写一下UIButton与UITableView的层级结构 ... -
socket二进制报文
2014-05-09 15:18 1261里面有帧头 字符串UTF-8 中间用0隔开 又一个字符串 ... -
将网站添加到桌面的方法
2014-05-08 14:25 1630<link href="http://www. ... -
iPhone通讯录联系人操作大全
2014-05-07 10:29 14111.需要引入AddressBook.framework框架 2 ... -
sqlite获取最新插入的rowid
2014-05-07 09:59 1485除了 last_insert_rowid select max ... -
号码归属地查询,拨打电话
2014-05-06 15:07 801在程序内调用拨打电话的方法,[[UIApplication s ... -
iOS时间合并
2014-04-28 17:55 1030合并同一时间的课程,同一时间可能有多个课程,比如13:30-1 ... -
vCard通讯录格式说明
2014-04-28 16:47 2454原帖:http://freesoftman.iteye.com ... -
UISearchBar背景色全套解决方案
2014-04-25 09:36 7400os系统升级到7.1后,原来在7.0下显示正常的UISearc ... -
升级XCode5.1.1遇到的奇葩问题NSString,NSObjectRuntime.h报错,Foundation找不到
2014-04-24 11:19 863升级XCode5.1.1遇到的奇葩问题NSString,NSO ... -
将NSString转为NSArray
2014-04-22 16:52 6235// Your JSON data: NSString *c ... -
另外一种NSData转为NSString的方法
2014-04-22 15:40 1171If the data is not null-termina ... -
HTTP,Socket,WebSocket异同
2014-04-18 16:54 1798参考文章: http://abbshr.g ... -
push隐藏UINavigtaionBar和UITabbar
2014-04-17 15:20 1052[self.navigationController setN ...
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