IOS之constraints

【IOS之constraints】的更多相关文章

anyway, you can do this with auto layout. You can do it entirely in IB as of Xcode 5.1. Let's start with some views: The light green view has an aspect ratio of 4:1. The dark green view has an aspect ratio of 1:4. I'm going to set up constraints so t…

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 code, then you will need to constrain them programmatically. 如果你的view是由代码创建的,那么你需要用编程限制它了. To have a view to work with, you are going to recreate the im…

cordova for ios: Unable to simultaneously satisfy constraints.

使用cordova开发ios项目的时候,在上传图片碰到一个问题.使用html的<input type="file"/>标签来选择照片或者拍照片,引起了布局报错,然后图片上传过程中很容易崩溃闪退. html页面代码: <html><head></head> <body> <input type="file" /> </body> </html> 然后在真机测试,点击选择文件…

iOS开发之Masonry框架源码深度解析

Masonry是iOS在控件布局中经常使用的一个轻量级框架,Masonry让NSLayoutConstraint使用起来更为简洁.Masonry简化了NSLayoutConstraint的使用方式,让我们可以以链式的方式为我们的控件指定约束.本篇博客的主题不是教你如何去使用Masonry框架的,而是对Masonry框架的源码进行解析,让你明白Masonry是如何对NSLayoutConstraint进行封装的,以及Masonry框架中的各个部分所扮演的角色是什么样的.在Masonry框架中,仔细…

【转】漫谈iOS程序的证书和签名机制

转自:漫谈iOS程序的证书和签名机制接触iOS开发半年,曾经也被这个主题坑的摸不着头脑,也在淘宝上买过企业证书签名这些服务,有大神都做了一个全自动的发布打包(不过此大神现在不卖企业证书了),甚是羡慕和崇拜.于是,花了一点时间去研究了一下iOS这套证书和签名机制,并撰文分享给需要的朋友.由于本人才疏学浅,多有遗漏或错误之处,还请大神多多指教. 非对称加密和摘要非对称加密的特性和用法非对称加密算法可能是世界上最重要的算法,它是当今电子商务等领域的基石.简而言之,非对称加密就是指加密密钥和解密密…

Unable to simultaneously satisfy constraints.

在进行版本的迭代更新时,新功能需求需要对主页面的UI进行重新的布局,但是,报了错误,出了好多约束方面的问题: Unable to simultaneously satisfy constraints. Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out whi…

[转][iOS]NSHashTable & NSMapTable

NSSet and NSDictionary, along with NSArray are the workhorse collection classes of Foundation. Unlike other standard libraries, implementation details are hidden from developers, allowing them to write simple code and trust that it will be (reasonabl…