iOS开发周笔记12

2023-02-11 04:36| 来源: 网络整理| 查看: 265

Literals in Swift Code C644E734-80BA-47DA-8060-BF620558B412.png

可以让我们在代码中快速的选取color,image,file @1 code Image Literal

37EBC9C5-E48D-452E-ACC1-03109684BD52.png

@2 code Color Literal

图片.png

@3 file 没有UI界面来选择文件不过也可使用代码快捷选取

let citiesJSONURL = #fileLiteral(resourceName: "Cities.json") Navigation bar

1.1 Navigation Prompt iOS8之前 navigationItem.prompt = "Navigation prompts appear at the top."必须放在 viewDidAppear之后。这是个已知Bug iOS8+ 已更正 1.2 Extended navigation bar navigation bar 在7以后本身的frame 是无法随意更改的。不过有解决办法

51A2A2EB-518E-4D74-9995-F9A1EE81E332.png

@1 首先将bar 特殊属性更改掉

//去掉半透明属性 navigationController!.navigationBar.isTranslucent = false //去掉bar下面灰色细线 navigationController!.navigationBar.shadowImage = #imageLiteral(resourceName: "TransparentPixel") //设置背景色 navigationController!.navigationBar.setBackgroundImage(#imageLiteral(resourceName: "Pixel"), for: .default)

@2 之后添加我们想要的view在下面，不过我们得在扩展的view下面模拟bar的灰色细线利用阴影

layer.shadowOffset = CGSize(width: 0, height: CGFloat(1) / UIScreen.main.scale) layer.shadowRadius = 0 layer.shadowColor = #colorLiteral(red: 0, green: 0, blue: 0, alpha: 1).cgColor layer.shadowOpacity = 0.25

1.3 其他 shadowImage 要与 backgroundImage一同调用局部更改back backIndicatorImage和backIndicatorTransitionMaskImage一同调用

UIImage

1.图片的拉伸

open func resizableImage(withCapInsets capInsets: UIEdgeInsets) -> UIImage

capInsets 是规定了不能拉伸的范围 2.color -> image

UIGraphicsBeginImageContextWithOptions(CGSize(width: 1, height: 1), false, UIScreen.main.scale) let context = UIGraphicsGetCurrentContext() context?.setFillColor(UIColor(red: 1, green: 2, blue: 1, alpha: 0).cgColor) UIRectFill(CGRect(x: 0, y: 0, width: 1, height: 1)) let image = UIGraphicsGetImageFromCurrentImageContext() UIGraphicsEndImageContext()

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