iOS - Michael's Blog

iOS

A collection of 9 posts

How to use NSCache in Swift

NSCache is a mutable dictionary that you could use to cache some data that are expensive to create, so it could improve your app performance. If memory is needed by other applications, it would remove some items from the cache, minimizing its memory footprint, then some values need to be

How to implement recursiveDescription method in Swift

You might find out that the private method of UIView recursiveDescription is useful, especially when you want to debug your view hierarchy. You could run the following command from the LLDB prompt in Xcode: po view.value(forKey: "recursiveDescription")! It would print the view hierarchy for you, all the views

How to scroll UITableView to the top

There is an instance method of UIScrollView called setContentOffset(_:animated:) [https://developer.apple.com/documentation/uikit/uiscrollview/1619400-setcontentoffset] . As UITableView is a subclass of UIScrollView, you could also use this method. If you need to scroll the table view to the top, you just call this method like below: tableView.

Swift 3 Migration Issues

As you already know that Swift 3 is released [https://swift.org/blog/swift-3-0-released/], I guess you guys are busy migrating your project to Swift 3 now. So this post I just list some issues I came across during migrating to Swift 3. 1.Instance method 'application(:didFinishLaunchingWithOptions:)' nearly

iAd App Network Discontinued

I got one mail from Apple two days ago saying that the iAd App Network and related advertising services will be discontinued on June 30, 2016. I have one app that is using iAd, so I guess that's why I got the mail. So I just removed the iAd.Framework

App Submission Issues

I bet many iOS developers are busy submitting apps to the App Store lately after fixing issues on iOS 9. This blog post just listed the issues I came across lately when submitting apps to App Store. 1. I was using Xcode 7 GM to submit one app, which uses

WatchKit Learning Resources

WatchKit是Apple发布的用来开发Apple Watch应用的框架，本文主要列出一些关于WatchKit的学习资源。 * Apple官方推出的Apple Watch Programming Guide [https://developer.apple.com/library/ios/documentation/General/Conceptual/WatchKitProgrammingGuide/index.html] * WatchKit Development Tips [https://developer.apple.com/watchkit/tips/] * Apple Watch Human Interface Guidelines [https://developer.apple.com/library/ios/documentation/UserExperience/Conceptual/WatchHumanInterfaceGuidelines/index.html] * Raywenderl

Xcode 6 Simulator Folder

本文主要介绍一下Xcode 6的iOS模拟器的应用目录的变化。 Xcode 5的iOS模拟器的应用的目录是在~/Library/Application Support/iPhone Simulator//Applications/{Application_ID} Xcode 6的目录改为 ~/Library/Developer/CoreSimulator/Devices/{Device_ID}/data/Containers/Bundle/Application/{Application_ID}/ 这里的Device_ID和Application_ID都是一串UUID，如果想查找不同的模拟器对应的Device_ID，可以通过在Terminal执行命令 xcrun simctl list，如下图所示 iOS模拟器的管理工具SimPholders2 [http://simpholders.com/]也针对此变动进行了更新。 Hope this helps, Michael

Swift Learning Resources

Swift是Apple在今年的WWDC推出的一门新的编程语言，它的1.0版本跟着Xcode 6正式发布了。本文主要列出一些关于Swift的学习资源。 * Apple官方推出的iBook The Swift Programming Language [https://itunes.apple.com/us/book/the-swift-programming-language/id881256329?mt=11&ls=1] web版 The Swift Programming Language [https://developer.apple.com/library/ios/documentation/Swift/Conceptual/Swift_Programming_Language/] * Using Swift with Cocoa and Objective-C [https://developer.apple.com/library/