iOS开发常用Tips - 姚宁的博客

语言相关

swift退出命令行

ctrl+d

工具相关

pod忽略三方库警告
```
:inhibit_warnings => true
```
pod指定Github版本
```
:git => '{path}'
```
eg. eg. pod 'Spring', :git => 'https://github.com/MengTo/Spring.git', :inhibit_warnings => true
swift格式化代码插件
Swimat
下载后启动Swimat这个App 根据提示在系统偏好设置里边开启权限
设置快捷键-> Xcode->Preferences->Key Bindings 搜索swimat 配置上快捷键即可

API相关

navigationItem 使用图片被tintColor干扰

let leftItem = UIBarButtonItem.init(image: UIImage.init(named: "nav_logo")?.withRenderingMode(.alwaysOriginal), style: .done, target: self, action: #selector(clickMenu))
navigationItem.leftBarButtonItem = leftItem

修改TextField光标颜色

// 全局修改
UITextField.appearance().tintColor = UIColor.black
// 单个修改
let textField = UITextField()
textField.tintColor = UIColor.black

解析来自server gbk编码的char

[NSString stringWithCString:cstr encoding:CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000)];

实现view跟随手指拖拽

class EPQuestionCommitButton: UIButton {

 override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
     guard let touch = touches.first else {
         return
     }
     let currentPoint = touch.location(in: self.superview)
     let previousPoint = touch.previousLocation(in: self.superview)

     var center = self.center

     center.x += (currentPoint.x - previousPoint.x)
     center.y += (currentPoint.y - previousPoint.y)

     let maxX = (self.superview?.frame.size.width)! - self.frame.size.width / 2
     let minX = self.frame.size.width / 2
     if center.x > maxX {
         center.x = maxX
     } else if center.x < minX {
         center.x = minX
     }

     let maxY = (self.superview?.frame.size.height)! - self.frame.size.height / 2
     let minY = self.frame.size.height / 2
     if center.y > maxY {
         center.y = maxY
     } else if center.y < minY {
         center.y = minY
     }

     self.center = center
 }
}

实现WebView加载进度显示

class EPWebViewController: UIViewController {
 fileprivate lazy var processView: UIProgressView = {
     let processView = UIProgressView()
     processView.tintColor = GlobalColor.happyColor
     return processView
 }()

 let pregressKeyPath = "estimatedProgress"

 override func viewDidLoad() {
     super.viewDidLoad()
     ...
     webView.addObserver(self, forKeyPath: pregressKeyPath, options: .new, context: nil)
     ...
 }

 ...
 override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
     if keyPath == pregressKeyPath {
         processView.alpha = 1.0
         processView.setProgress(Float(webView.estimatedProgress), animated: true)
         if webView.estimatedProgress >= 1.0{
             UIView.animate(withDuration: 0.3, delay: 0.1, options: .curveEaseInOut, animations: {
                 self.processView.alpha = 0.0
             }) { (finished) in
                 self.processView.progress = 0.0
             }
         }
     }
 }
    
 ...
 deinit {
     webView.removeObserver(self, forKeyPath: pregressKeyPath)
     log.info("EPWebViewController deinit")
 }
}

日期选择器时间校准

let timeZone = NSTimeZone.system
datePicker.date.addTimeInterval(TimeInterval(timeZone.secondsFromGMT(for: datePicker.date)))
pickerOk!(datePicker.date)

日期选择器初始化阻塞主线程

UIDatePicker 在viewdidload中
addsubview加入主界面 耗时大约0.5s  
建议使用UIActivityIndicatorView先展示  
将addsubview放在viewDidAppear中做并定死宽高  

其他

处理器架构知识

在iOS编程时如果要运行在模拟器上，代码生成的机器指令时就需要指定使用i386还是x64指令集，因为目前的mac电脑上基本采用了x86或者x64架构的CPU
arm64： iPhoneX | iPhone8 | iPhone7 | iPhone6s | iphone6s plus｜iPhone6｜ iPhone6 plus｜iPhone5S | iPad Air｜ iPad mini2(iPad mini with Retina Display)
armv7s：iPhone5｜iPhone5C｜iPad4(iPad with Retina Display)
armv7：iPhone4｜iPhone4S｜iPad｜iPad2｜iPad3(The New iPad)｜iPad mini｜iPod Touch 3G｜iPod Touch4

i386是针对intel通用微处理器32位处理器  
x86_64是针对x86架构的64位处理器
模拟器32位处理器测试需要i386架构，
模拟器64位处理器测试需要x86_64架构，
真机32位处理器需要armv7,或者armv7s架构，
真机64位处理器需要arm64架构。