So, I was playing around with Xcode a bit, and a couple hours ago, I started noticing that all of my transition animations when switching between views, and first loading the app, are running really slowly. When I say slowly, I mean the initial switch between the launch screen and the first view controller taking about 10 seconds to fully finish. Has anybody else heard of this happening? I have closed and restarted Xcode many times, and I am convinced that it has nothing to do with my code.
Please help! It's driving me nuts!
iOS Simulator -> Debug -> Slow Animations,
close.
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I am facing strange problem in my application. If I am using my Application in a normal way then all the things are going good and transition is smooth when going to next controller or coming from the previous one.
Problem arises when say I launched my application and say I let my application idle for few minutes, it is active not in background then in this case the transition effect is not smooth when going to next screen or coming back to previous one. It feels like my application is going slow,Loader comes in slow motion and hides too, Navigation also seems to be slow. Did anyone faced the same issue like me,if yes please share the solution.
I have an iOS Xcode project that previously would load fast, but from time to time, now will hang for five seconds or more during loading. When the app is run on an iPhone, the launch screen displays instantly, but sometimes, not always, and unpredictably, the app just hangs for around 5 seconds or more until the actual interface is displayed. It occurs both on the simulator and device across different iOS versions 7, 8, 9.
Recently, a UIView's class that contains a drawRect function was changed slightly, it has an outlet connection to one of the ViewControllers, but no significant changes made overall. One ViewController has code in the ViewDidLoad, ViewWillAppear, ViewDidAppear functions. All these things I'm investigating if they are impacting the load time.
When I terminate the app, the next time I try running it, it loads super fast without issue. I have no idea what to make of this load behaviour.
Questions
1 - What methods can I use in Xcode to debug an app that loads slowly at irregular and unpredictable times?
2 - What obvious items should I be on the look out in the project that typically cause slow or prolonged load times?
3 - Does Xcode include tools to monitor the processes operating live while loading occurs?
4 - Is it possible to print output for load processes I can review?
Any experienced advice really appreciated. Thanks.
Not sure if you have looked instrumentation. It is the best way to determine this kind of issues with your app.
https://developer.apple.com/library/watchos/documentation/DeveloperTools/Conceptual/InstrumentsUserGuide/index.html
When I terminate the app, the next time I try running it, it loads super fast without issue. I have no idea what to make of this load behavior.
Do you mean exiting the app? Or actually killing it? Cause if it is the former, then the reason is the app was just launched from a suspended state.
I would suggest take a closer look at didFinishLaunchingWithOptions:, and check if you are doing something that takes more time than needed. Run your app with the time profiler instrument, it will tell you where is your bottleneck.
I am running an app on the simulator and the launch screen is shown for much longer than normal, and then oddly fades into the app with what seems to be an opacity animation. I commented out all functions up until the viewDidLoad in the initial view controller and this didn't help. I placed log statements at points that might be slowing down or delaying but all the logs are logged out immediately and then this delay goes on for a few seconds and the fade happens. I tried using time profiler in instruments but the read-outs from completely mysterious to me.
Is this familiar to any one or are there other steps I can take to resolve this?
Sounds like you accidentally turned on Slow Animations in the simulator. Just turn it off again (Debug > Slow Animations, Command-T).
I've having an issue with UIWebView and running HTML 5 games (that another developer is working on). We've tried two different options, and neither is optimal.
Option 1: He renders the HTML 5 game with "canvas drawing". When he does it this way, nothing crashes, however in iOS 9 when we go back into the app from the background, the Web View loads back up, but the game is moving much slower than normal (issue not on iOS 7.1 and above). By much slower I'm talking about the animations are not moving the same velocity that they were when we first load the game. The weird thing about this issue is that even if the user opens up a different HTML 5 game (we're adding multiple games) the animations are slower for that game as well. I've tried dismissing the Web View Controller when the UIApplicationWillResignActiveNotification gets posted. When I set the game up this way, the slowness only happens if the app is in the for 4 seconds (it's very strange).
Option 2: He renders the game with "WebGL". When he renders it this way, the app crashes when the app gets backgrounded on iOS 8.0 and above. My research into the crash is that iOS can't draw OpenGL ES in the background. I'm assuming that the WebGL commands are running similar commands as OpenGL ES would do, hence the crash. Dismissing the Web View Controller on UIApplicationWillResignActiveNotification still causes the crash to happen.
Has anyone else ever dealt with a situation like this?
I've not found a good solution to the problem, but I did find a work around.
When I get the App Will Resign Active message, I remove the UIWebView from the UIWebViewController's subview. When I get the Did Become Active message, I add the UIWebView to the UIWebViewController's subview.
This solution works for both cases.
Yesterday I updated my iPhone 5 to iOS 7.1 and found a strange bug in my current application. There is few UINavigationControllers. After few transition in it the animation of transition become to fast, like there is no animation at all. But more strange that all system animation became to fast, default UITableCell animation, modal window animation and so on.
Does someone know what is this? On device with 7.0.6 there is no such problem.
Looks like it starts to happen after few calls of:
[navController setViewControllers:popViewControllers animated:animated];
PS: One more thing - my app is still using iOS 6.1 SDK.
PPS: i don't use custom default animations.
UPDATE: With 7.1 SDK problem still exists.
I have similar problem after updating my iPhone from iOS 7.0.3 to 7.1. I go back and forth several times using the navigation bar and after a few tries there is no transition animation. All animations are broken when it happens, eg. device rotation animation. After reaching this state, few more back and forth transitions cause a crash.
Edit 3:
In my case the problem was because of accessing GUI objects from a background queue. If you experience this issue make sure all GUI objects are accessed from the main thread. Many thanks to Eugene for helping me figure this out.