An XCGLogDestination that adds the logs to a UITextView

XCGTextViewLogDestination

extension XCGLogger {
    
    public class XCGTextViewLogDestination: XCGLogDestinationProtocol, DebugPrintable {
        public var owner: XCGLogger
        public var identifier: String
        public var outputLogLevel: XCGLogger.LogLevel = .Debug
        
        public var showThreadName: Bool = false
        public var showFileName: Bool = true
        public var showLineNumber: Bool = true
        public var showLogLevel: Bool = true

        public var textView: UITextView
        
        public init(textView: UITextView, owner: XCGLogger, identifier: String = "") {
            self.textView = textView
            self.owner = owner
            self.identifier = identifier
        }
        
        public func processLogDetails(logDetails: XCGLogDetails) {
            var extendedDetails: String = ""
            
            if showThreadName {
                extendedDetails += "[" + (NSThread.isMainThread() ? "main" : (NSThread.currentThread().name != "" ? NSThread.currentThread().name : String(format:"%p", NSThread.currentThread()))) + "] "
            }
            
            if showLogLevel {
                extendedDetails += "[" + logDetails.logLevel.description() + "] "
            }
            
            if showFileName {
                extendedDetails += "[" + logDetails.fileName.lastPathComponent + (showLineNumber ? ":" + String(logDetails.lineNumber) : "") + "] "
            }
            else if showLineNumber {
                extendedDetails += "[" + String(logDetails.lineNumber) + "] "
            }
            
            var formattedDate: String = logDetails.date.description
            if let dateFormatter = owner.dateFormatter {
                formattedDate = dateFormatter.stringFromDate(logDetails.date)
            }
            
            var fullLogMessage: String =  "\(formattedDate) \(extendedDetails)\(logDetails.functionName): \(logDetails.logMessage)\n"

            textView.text = textView.text + fullLogMessage
        }
        
        public func processInternalLogDetails(logDetails: XCGLogDetails) {
            var extendedDetails: String = ""
            if showLogLevel {
                extendedDetails += "[" + logDetails.logLevel.description() + "] "
            }
            
            var formattedDate: String = logDetails.date.description
            if let dateFormatter = owner.dateFormatter {
                formattedDate = dateFormatter.stringFromDate(logDetails.date)
            }
            
            var fullLogMessage: String =  "\(formattedDate) \(extendedDetails): \(logDetails.logMessage)\n"
            
            textView.text = textView.text + fullLogMessage
        }
        
        // MARK: - Misc methods
        public func isEnabledForLogLevel (logLevel: XCGLogger.LogLevel) -> Bool {
            return logLevel >= self.outputLogLevel
        }
        
        // MARK: - DebugPrintable
        public var debugDescription: String {
            get {
                return "XCGTextViewLogDestination: \(identifier) - LogLevel: \(outputLogLevel.description()) showThreadName: \(showThreadName) showLogLevel: \(showLogLevel) showFileName: \(showFileName) showLineNumber: \(showLineNumber)"
            }
        }
    }
}

And to add it:

log.add(destination: XCGLogger.XCGTextViewLogDestination(textView: textView, owner: log, identifier: "com.cerebralgardens.xcglogger.logdestination.textview"))