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Chapter 27 Controlling Animations1. The simplest block-based animation method on UIView is animateWithDuration:animations:. This method takes in the d... 阅读全文
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Chapter 23 Core Data1. Core Data is only able to store certain data types in its store, and UIImage is not one of these types. Instead, you declared t... 阅读全文
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Chapter 21 WebServices and UIWebView1. Usually, fetch data from a web server using four handy classes: NSURL, NSURLRequest, NSURLSessionTask, and NSUR... 阅读全文
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Chapter 20 Dynamic Type1. The Dynamic Type system is centered around text styles. When a font is requested for a given text style, the system will use... 阅读全文
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Chapter 19 Subclassing UITableViewCell1. iOS provides a convenient suite of functions to create offscreen contexts and produce images from them. To cr... 阅读全文
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#pragma mark - Set thumbnailImage-(UIImage*)setThumbnailFromImage:(UIImage *)image{ CGSize origImageSize = image.size; // The rectangle of t... 阅读全文
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Chapter 18 Saving, Loading, and Application State1. Archiving is one of the most common ways of persisting model objects on iOS. Archiving an object i... 阅读全文
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Chapter 17 Autorotation, Popover Controller, and Modal View Controllers1.There are two distinct orientations in iOS: device orientation and interface ... 阅读全文
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调试用的iPad mini 被同事不小心更升级到了8.0。然后，今天调试半天程序一直崩溃，查了半天愣是没有找到原因。无意中撇到Organizer 中的 Device 版本竟然是8了，卧槽，找另一个7.1.2的机器试了下，一切ok啊。下班后下载了7.1.2的固件，回退失败！网上查到几天前苹果把shsh... 阅读全文
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Chapter 16 Auto layout: Programmatic Constraints1. The line of code regarding translating constraints has to do with an older system for scaling inter... 阅读全文