ViewController transition bottleneck in UITabBarController

Asked Nov 27 '15 at 19:29

Active Nov 27 '15 at 21:46

Viewed 39 times

When I tap on a specific UITabBarItem to switch ViewControllers, the transition takes about 4 - 5s.

There is no heavy processing being done, so this leads me to believe that the code is simply inefficient.

After having taken a look inside Instruments as suggested in the comments, I have pinpointed the following process to be taking ~> 2500 ms

Running Time    Self (ms)       Symbol Name
2485.0ms   44.3%    0.0     
TDescriptorSource::CopyDescriptorsForRequestFromArray(__CFArray const*, __CFDictionary const*, CFComparisonResult (*)(void const*, void const*, void*), void*, unsigned long, bool) const

and

Running Time    Self (ms)       Symbol Name
3070.0ms   54.7%    0.0      -[UIStackView initWithCoder:]

What does this mean?

edited Nov 27 '15 at 21:46

rmaddy

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asked Nov 27 '15 at 19:29

Eric Johnson

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is the delay happening first time or always ? device or simulator ? – Teja Nandamuri Nov 27 '15 at 19:34
Check out the instruments app, use the time profiler tool to study which objects are getting allocated and deallocated. Would certainly help if you could provide some code. – TheAppMentor Nov 27 '15 at 19:40
@Mr.T both device and simulator! – Eric Johnson Nov 27 '15 at 19:40
@TheAppMentor I just posted the results from Instruments – Eric Johnson Nov 27 '15 at 19:49
@Mr.T and this only happens the first time – Eric Johnson Nov 27 '15 at 20:40
Even i face the issue , same delay for the push transition for the first time!!! I didnt find any solution yet!!! If you come to know, plz let me know – Teja Nandamuri Nov 27 '15 at 20:54
@Mr.T My problem is with transitioning between `UITabBarController` tabs. It's not a push transition.. – Eric Johnson Nov 27 '15 at 21:06
Can you post an example project that demonstrates the issue? – matt Nov 27 '15 at 21:56
An easy way would be to put a couple of NSLog() statements with a timestamp in each view's ViewDidAppear(), ViewDidDisapear() to further try and narrow down the bottleneck. Run Analyze and check for any transition/animation warnings. Maybe try a System Trace profile too. – Alexander Nov 28 '15 at 00:38

ViewController transition bottleneck in UITabBarController

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