#Simpholders alternative how to#
#Simpholders alternative code#

#Simpholders alternative code#

Now, add a breakpoint at line 18 in correspondence of the line of code view.backgroundColor = UIColor.redColor(). Open the project and navigate to the ViewController.swift file. Download from here the Xcode project that contains a navigation controller with its root view controller (ViewController) and an additional view controller (SecondViewController). If you type help expression in the console, you get the following description: You can also use expression in combination with the Xcode breakpoints, which I will show you later.

#Simpholders alternative how to#

One of the LLDB commands is expression and in this post, I will show you how to use expression to debug Swift or Objective-C applications by injecting code at runtime and interacting with the objects of your app. If you want to know more about a particular command, just type help in the console followed by the command name, and LLDB will print out the help for that particular command. Another valuable resource is the previously mentioned LLDB webpage (). You can learn more about the different LLDB commands by typing help in the console or reading the documentation provided with Xcode. At this point, you can type LLDB commands in the console, as you can see in the following picture. The execution of the app is paused and LLDB attaches to it.

After compiling and running an app, you can access the LLDB console at any time by pressing the Pause button in the Xcode UI (see next figure). If you want to debug an iOS or watchOS app, you need to use LLDB from the Xcode console when executing the app with the Apple IDE. Unfortunately, executing LLDB from the Terminal app is only useful to debug apps that are not sandboxed. If you omit the xcrun command, the Terminal executes LLDB installed in the /usr/bin/ directory, which could contain a different version than the LLDB used by Xcode. The xcrun command points the Terminal to the LLDB version shipped with Xcode (the Xcode bundle contains tons of tools). You can run LLDB from the Terminal typing: xcrun lldb. In this app developer tutorial, I will show you how to use the LLDB debugger and the expression command when developing iOS and watchOS apps. Just a few years ago, LLDB replaced gdb, and now LLDB is the only debugger supported by Xcode. LLDB ( ), described on the official webpage as a next generation, high-performance debugger, is the debugger that’s currently shipped with Xcode.