iOS Custom UIButton edge insets Since a button has an image and a title, it's easier to implement this design with UIButton. But it's not obvious how to custom the button, let's see how this works out. First,
iOS 制作 App Store 预览视频 在 App Store 为 iOS 应用提供预览视频，可以让用户直观地了解应用的相关功能、提高浏览的转化率。下边介绍如何制作预览视频。 录制视频 视频需要至少提供5.5和6.5英寸两种尺寸，我们可以使用模拟器录制视频，节约成本。 在终端运行如下命令，开始录制视频： xcrun simctl io booted recordVideo app-preview.mp4 视频长度必须在15到30秒之间，同时为了方便用户观看，你可能需要调节操作的速度。 添加背景声 苹果要求视频必须带背景声，可以用下边的命令添加沉默的背景声。 ffmpeg -f lavfi
iOS Custom Mapping in HandyJSON subclass HandyJSON is a handy Swift JSON-Object serialization/deserialization library. Sometimes there is some special key in you JSON data, for example: { "description": "Hi" } Since description is a property of
iOS Fix layout issue for tableHeaderView At times, there's some strange auto layout issue with tableHeaderView, the subview is either compressed or stretched. I check and re-check all constraints were set up correctly, it's especially frustrating. Here a container
iOS "error: unable to read SDK settings" After I upgraded my MacBook to macOS Mojave, for every command executed in my Terminal I got error message like this: git: error: unable to read SDK settings for '/Library/Developer/CommandLineTools/
iOS Dynamic collectionView in UITableViewCell Recently I'm building a page like this: There's a dynamic collectionView in every UITableViewCell, for the self-sizing UITableViewCells to work, override systemLayoutSizeFitting: class TableViewCell: UITableViewCell { @IBOutlet weak var collectionView: UICollectionView! override func systemLayoutSizeFitting(
iOS weak or unowned? In Swift, we often use weak or unowned to break reference cycles for closures. I use unowned a lot because I don't have to handle optinal type. I love concise code. For example:
iOS Random UITableView NSRangeException Recently I'm building a page to display long images for product descriptions. The image was split in several short images for better performance. I download the image in ProductImageCell and use closure didUpdateHeight
iOS Implicit retain cycle in lazy var When writing Swift code, it's easy to to create retain cycles if you're not careful. It usually happens when a closure has a strong reference to self and self has a strong referenc
iOS Fix animations in Eureka Recently I'm using Eureka for building forms dynamically. I show or hide some rows based on API data and the animation is strange, I couldn't find a way to disable it with Eureka
iOS Firebase Database doesn't work with Shadowsocks proxy I'm working with Firebase Database in an app. I found out it doesn't work with Shadowsocks proxy in the latest iOS 11 beta, I have to use VPN. This happens on both device
iOS It's a feature, not a bug Today I learned something new about UIViewController, I thought it's a bug but it's not. Here is the situation, I have a ManageBankCardViewController which manage ManageBankCardView and AddBankCardView and swith between the two
iOS 使用FIR安装测试版失败 使用FIR发布测试版后，安装失败，查看安装过程中的相关Log为 entitlement 'get-task-allow' has value not permitted by provisioning profile -[MICodeSigningVerifier performValidationWithError:]: 186: Failed to verify code signature of (Entitlements found that are not permitted by provisioning profile) 检查后发现安装失败的原因为：项目的Build
iOS iOS网页离线开发笔记 离线HTML 1.使用Ono解析HTML，将其中的图片、JS保存到本地 2.使用以下方法加载本地的HTML，通过baseURL指定相关资源的路径 - (void)loadHTMLString:(NSString *)string baseURL:(NSURL *)baseURL 自定义NSURLProtocol 可以通过继承NSURLProtocol来自定义网络请求 [NSURLProtocol registerClass:[CustomURLProtocol class]]; 比如，使WebView中的某类链接显示默认的本地图片 @interface CustomURLProtocol () <NSURLConnectionDelegate> @end @implementation CustomURLProtocol + (BOOL)
Reading Notes 读《objc-zen-book》 条件表达式 条件表达式的主体应该总是包含在大括号中： //推荐 if (!error) { return success; } //不推荐 if (!error) return success; 提前将列外情况排除，而不是将重要的代码置于条件表达式的主体，这样的代码更易读 //推荐 - (void)someMethod { if (![someOther boolValue]) { return; } } //不推荐 - (void)someMethod { if ([someOther boolValue]) { //Do something important
Reading Notes 读《Objective-C基础教程》 Objective-C基础 Cocoa对其所有函数，常量和类型名称都添加来NS前缀。该前缀表明函数来自Cocoa而不是其他工具包。 @符号是Objective-C在标准C语言基础上添加的特性之一。双引号中打字符串前有一个@符号，这表示引用的字符串应该作为Cocoa的NSString元素来处理。 Objective-C中的BOOL实际上是一种对带符号的字符类型（signed char）的定义（typedef），它使用8位存储空间。YES定义为1，NO定义为0（使用#define）。 Objective-C中所有对象间的交互都是通过指针实现的。 导入头文件的两种不同的方法： #import <Cocoa/Cocoa.h>,用于导入系统头文件。 #import “Tire.h”,导入项目本地的头文件。 比较字符串时，应该使用isEqualToString；
iOS AFNetworking parse JSON Unescaped control character 1.Add chandan's method removeUnescapedCharacter to class AFURLResponseSerialization in AFNetworking 2.0. 2.Add responseString = [self removeUnescapedCharacter:responseString]; under NSString *responseString = [[NSString alloc] initWithData:data encoding:stringEncoding]; in method - (id)responseObjectForResponse:(NSURLResponse