iphone - UI blocks while pushing view controller on to navigation controller -


i have moved ios 5 project ios 6 environment (since apple made mandatory support 4-inch device compability) , having bit of problem while pushing uiviewcontroller on uinavigationcontroller.

after push custom uiviewcontroller, user interface blocks 5 20 seconds, when pushing custom uiviewcontroller first time. if pop uiviewcontroller , push again, there no delay or ui block.

here happens;

first pushing uiviewcontroller uitableviewcontroller's didselectrowatindexpath (custom init works fine, no issue there)

campaigndetailviewcontroller *detailviewcontroller = [[campaigndetailviewcontroller alloc] initwithproduct:selectedproduct];     [self.navigationcontroller pushviewcontroller:detailviewcontroller animated:yes];

than logging (i cleared code in viewdidload, viewwillappear , viewdidappear, means pushing controller should load nib)

on pushed uiviewcontroller;

- (id)initwithproduct:(product *)selectedproduct {     nslog(@"starting init");     self = [super initwithnibname:@"campaigndetailviewcontroller" bundle:nil];     nslog(@"nib loaded");     if (self) {         self.navigationitem.title = selectedproduct.name;         self.product = selectedproduct;     }     nslog(@"finishing init");     return self; }  - (void)viewdidload {     nslog(@"starting viewdidload");     [super viewdidload];     nslog(@"finishing viewdidload"); }  - (void)viewwillappear:(bool)animated {     nslog(@"view appear"); }  - (void)viewdidappear:(bool)animated {     nslog(@"view did appear"); }

debugger log;

2013-05-03 12:33:49.678 my-app[1429:707] starting init 2013-05-03 12:33:49.680 my-app[1429:707] nib loaded 2013-05-03 12:33:49.683 my-app[1429:707] finishing init 2013-05-03 12:33:49.808 my-app[1429:707] starting viewdidload 2013-05-03 12:33:49.855 my-app[1429:707] finishing viewdidload 2013-05-03 12:33:49.861 my-app[1429:707] view appear 2013-05-03 12:35:28.501 my-app[1429:707] view did appear

there on 30 seconds of delay between viewwillappear , viewdidappear.

further info

  • i have tried use regular init , removed nib file, nothing changed.
  • nothing gets loaded in between of pushviewcontroller , loading uiviewcontroller.
  • this issue happens on iphone 4 - ios 5 device. works fine on ios 5 , 6 simulators works fine on iphone 5 - ios 6 device.
  • i pushing other view controllers on other parts of project well, uiviewcontroller seems issue.
  • view controller pushed on main thread, , therefore view controller loaded on main thread
  • during blocked period, xcode (4.6.1) gets blocked , not responds well

two hints:

1 - issue happening on simulator or on real device? i've experienced many unexpected delays on simulator.

2 - remember call 

[super viewwillappear:animated];

and

[super viewdidappear:animated];

inside impelentations.

from apple documentation:

if override method, must call super @ point in implementation.


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