xcode-instruments

问题 I am new to Instruments in iOS. I am trying to find the memory leak in instruments and using Xcode 4.5.2 and following this tutorial: http://soulwithmobiletechnology.blogspot.sg/2011/04/how-to-check-memory-leaks-in-xcode-4.html. I am able to find the memory leak and able to press the arrow to go to history of the memory leak item. But when i double-click any of them, it doesn't show the line it is causing the memory leak. The image is like this: What am i doing wrong? Need some guidance...

问题 I've just started playing with Xcode 4, and found that, no matter how I setup debugging symbols in the project, Instruments refuses to display source lines for stack trace items that correspond to my code. In only shows hex offsets and identifies my executable as the owning module. Turning on "Source Location" draws a blank too. This occurs even for the skeleton OpenGL ES project generated by Xcode (File → New → New Project... → iOS → Application → OpenGL ES Application). This problem only

问题 Does any body know what I have to check if my app freezes? I mean, I can see the app in the iPad screen but no buttons respond. I have tried debugging the code when I click on the button, but I haven't seen anything yet. I was reading about the Instruments tools; specifically how do I use them? Can anybody help me? I just need an explanation about how use the tools. 回答1: It sounds like you've blocked the main thread somehow. To debug, run the app in the debugger and when the app freezes, hit

问题 As can been seen in this screen shot from instruments, Allocations thinks my application (Ongo) is only using 7.55 MBs of memory, while Memory Monitor says 53.30. Further more the free system memory has little to no correlation to the amount of memory that the app is using. Does anyone know why there is such a big disagreement between these two tools? Additionally is it possible to find the source of the low system memory or how to keep it from running out so quickly? My app doesn't appear to

问题 I am trying to profile my iOS app, but everytime i profile it, the instruments(time profiler to be specific) it shows the error: unable to locate the device's timestamp . I am unable to find the reason why this might be happening. Any pointers? The xcode version is 9.2 and my iPAD is on ios version-12.0.1. 回答1: The reason it's happening is that Xcode 9.2 does not support versions of iOS later than iOS 11.2, including iOS 12. You have two options: use Xcode 10 to profile on your iPad or

问题 I am trying to understand how to find memory issues using Instruments and fix them. I'm using the project in Chapter 20 of Big Nerd Ranch Guide that creates an artificial memory leak for this purpose. Overview the project, (complete source code is at this github location https://github.com/smartiothome/BMI) Creates 3 classes Person, Employee (that inherits from person) and Assets. Definitions of the 3 classes are in github project. But most important points are Employee class has an instance

问题 In my code am creating a Core Foundation object, and from the apple documentation i came to know that "The life span of a Core Foundation object is determined by its reference count" https://developer.apple.com/library/mac/documentation/CoreFoundation/Conceptual/CFMemoryMgmt/Articles/lifecycle.html So I highly doubt that whether the core foundation objects are released by ARC or do we need to release by writing CFRelease(myobject) Am using Xcode 6.4,and presently in my code am not using any

问题 If I open Instruments and select a standard application (e.g. Mail or MS Word) it has no issue. If I am in Xcode and I go to Product > Profile (or press Cmd + I ), it launches Instruments, allows me to select a template, and loads the standard screen. Then the downward arrow starts tracing to the right as it should, and the iOS simulator launches the program. However, nothing is plotted in Instruments. It shows no changes to anything no matter what the app is doing. I can't click anything in

问题 I am having problem on memory leak tracking, i did try profiling but the instrument shows firapb_decode_repeated_user_attribute as as responsible object. And while i try to track code it takes me to assembly code which is more painful. Do anybody have similar issue or have some clue to track this issue, It will be a lot for me. Leaked Object # Address Size Responsible Library Responsible Frame Malloc 32 Bytes 1 0x600000231ba0 32 Bytes appName firapb_decode_repeated_user_attribute The Assembly

问题 When I run the following code (a simplified example, created to demonstrate the crash), it executes as expected when I choose Run (both os_log messages print in Console). However, when I open it in Instruments from the Memory Debug Navigator - by pressing Restart - it crashes (only the first os_log message prints in Console). The crash occurs at observe(...). import os import UIKit class ObserverCrashingExample: NSObject { @objc private var animation: UIViewPropertyAnimator? private var