如何使用Xcode 6在iPhone 4上部署和调试iOS应用

Question

I have an app which is crashing on iPhone 4 having 7.1 installed , i want to debug app on phone using xcode 6, is it possible(as it shows unavailable currently) ? if not what are the options I am left with ?

Answer 1

There is no option for an "iPhone 4 Simulator" in Xcode 6. But, if you use an iPhone 4S simulator with iOS 7.1, you can achieve the same effect, because with the same screen size and OS they are essentially the same for testing on the simulator. Also see this question for reference.

Of course, if you have a physical iPhone 4, you can also test on the actual device. Make sure that your Deployment Target under TARGETS AND the iOS Deployment Target under PROJECT are set to 7.1 or below. Your Base SDK can be set higher, but this means you will have to make sure that you are either not using features or classes that are unavailable in earlier versions of iOS, or do a version check and adapt your program accordingly. For example, UIAlertController was introduced in iOS 8, and will crash a device below that if it is invoked. So you might want to do a version check and use good old UIAlertView if the iOS device version is below 8. An issue like this is the most probable cause of your crash.

Also, if it's the first time you're using this device for development, don't forget to set it up by going to Window -> Devices , selecting your connected device, and pressing Use for development .

If you don't have the iOS 7.1 SDK and don't see it as a iPhone 4S (7.1) in the simulator selection, you need to download it by going to Preferences -> Downloads .