iOS开发中Log打印是最为常见的调试方式,没有之一.
Swift提供了两种打印方式

public func print(_ items: Any..., separator: String = default, terminator: String = default)

public func debugPrint(_ items: Any..., separator: String = default, terminator: String = default)

debugPrint可以自己识别是否是release环境,如果是release环境就不会打印
虽然Swift贴心的提供了debugPrint这个方法,但是对于Log太多的项目来说,找到自己的打印信息还是费点眼睛的.
如果打印出时间,文件,方法那么就更好了
废话不多说,直接上代码
首先需要在Build Setting -> Other Swift Flags设置一下

屏幕快照.png

public func OKPrint( _ object: @autoclosure() -> Any?,
                     _ file: String = #file,
                     _ function: String = #function,
                     _ line: Int = #line) {
    #if DEBUG
        guard let value = object() else {
            return
        }
        var stringRepresentation: String?
        
        if let value = value as? CustomDebugStringConvertible {
            stringRepresentation = value.debugDescription
        }
        else if let value = value as? CustomStringConvertible {
            stringRepresentation = value.description
        }
        else {
            fatalError("gLog only works for values that conform to CustomDebugStringConvertible or CustomStringConvertible")
        }
        
        let gFormatter = DateFormatter()
        gFormatter.dateFormat = "HH:mm:ss:SSS"
        let timestamp = gFormatter.string(from: Date())
        let queue = Thread.isMainThread ? "UI" : "BG"
        let fileURL = NSURL(string: file)?.lastPathComponent ?? "Unknown file"
        
        if let string = stringRepresentation {
            print("✅ \(timestamp) {\(queue)} \(fileURL) > \(function)[\(line)]: \(string)")
        } else {
            print("✅ \(timestamp) {\(queue)} \(fileURL) > \(function)[\(line)]: \(value)")
        }
    #endif
}