Your Site Title

iOS 系统兼容

9.0

1. Safe Area Layout Guide before ios 9.0

9.0 前使用Top Layout Guide和Bottom Layout Guide进行约束, 11中被弃用 , 9.0 使用Safe Area.

为了兼容8.0, 需要使用Top Layout Guide 和 Bottom Layout Guide

1. storyboard中选择ViewController
2. File inspector中`Builds for` 选择 `iOS 9.0 and Later`
3. 去掉`Use Safe Area Layout Guides`

11.0

1. WKWebView before iOS 11.0 (NSCoding support was broken in previous versions)

Webkit framework是iOS 8, macOS 10.10中引入的, 用来取代UIWebView和WebView 但是8.0中在storyboard中使用WkWebView报错, 需要在代码中创建

13.0

1. TextField [setValue:[UIFont systemFontOfSize:14] forKeyPath:@”_placeholderLabel.font”]

版本13不能使用`forKeyPath`访问修改对象内容实现

  1. 使用runtime

    Ivar ivar = class_getInstanceVariable([UITextField class], “_placeholderLabel”); UILabel *placeholderLabel = object_getIvar(textField, ivar); placeholderLabel.textColor = [UIColor whiteColor];

  2. 使用attributedPlaceholder

    let textField = UITextField() textField.frame = CGRect(x: 0, y: 100, width: 300, height: 50) let placeholderString = NSAttributedString.init(string: “UITextField Demo”, attributes: [NSAttributedString.Key.foregroundColor : UIColor.red]) textField.attributedPlaceholder = placeholderString view.addSubview(textField)

2. ASSETCATALOG_COMPILER_APPICON_NAME

xcode 中AppIcons 和 LaunchImages 可以直接指定文件. 现在LaunchImages不能, 可以手动 指定.

	Project Targets -> Build Settings -> Asset Catalog Compiler - Options
	// 设置启动页
	ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME = LaunchImage
	// 设置图标
	ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon
This site is open source. Improve this page.