Instruments15.3(From XCode15.4)Can't find source code for selected symbol

lichuange — Thu, 18 Jul 2024 11:46:35 +0000

Recently i have meet the issue that Can't find source code for selected symbol in XCode instruments with version 15.3.

My environment:
Mac: MacBook Pro(Apple M3 Pro), MacOS Sonoma Version 14.2.1
XCode: 15.4
Instrument: 15.3 within the Xcode

The problem is showed as below

If choose Recording Mode with Last

there will be the issue 'Can't find source code for selected symbol',

and the paths of system frameworks are located at '/System/Library/PrivateFrameworks/...' which are for MacOS not for iOS.

Some tries to solve the problem

If choose Recording Mode with Deferred,

symbols can be resolved and the frameworks paths are all correct at '/Users/xxx/Library/Developer/Xcode/iOS DeviceSupport/iPhone13,2 17.5.1 (21F90)/Symbols/System/Library/PrivateFrameworks/...'.

As result, I think this is a bug of XCode instruments, expecting fixed in the following version.

Testing UICollectionViewCell reuse behavior

lichuange — Fri, 08 Mar 2024 03:33:46 +0000

The behavior of reusing UICollectionViewCell while reload UICollectionView is diverse.

Here gives some cases to test the result.

Case1: Call the method `reloadData` directly

eg.

[self.collectionView reloadData];

Result:
All cells are recycled and reused in an unordered manner, without any animation.

Case2: Call the method `reloadData` inside `performBatchUpdates`

eg.

[self.collectionViewperformBatchUpdates:^{
   [self.collectionView reloadData];
} completion:^(BOOL finished) {
}];

Result:
The method cellForItemAtIndexPath is not invoked, and no cells are recycled or reused, but with animation.

Case3: Call the method `reloadItemsAtIndexPaths` directly

eg.

[self.collectionView reloadItemsAtIndexPaths:@[[NSIndexPath indexPathForRow:btn.tag inSection:0]]];

Result:
The method cellForItemAtIndexPath is called for the current row, where a new cell is created and applied, while the old one is recycled to reuse pool, with animation.

Case4: Call the method `reloadItemsAtIndexPaths` inside `performBatchUpdates`

eg.

[self.collectionViewperformBatchUpdates:^{
    [self.collectionView reloadItemsAtIndexPaths:@[[NSIndexPathindexPathForRow:btn.taginSection:0]]];
} completion:^(BOOL finished) {
}];

Result:
Same as Case3, the method cellForItemAtIndexPath is called for the current row, where a new cell is created and applied, while the old one is recycled to reuse pool, with animation.

DEV Community: lichuange

Instruments15.3(From XCode15.4)Can't find source code for selected symbol

The problem is showed as below

Some tries to solve the problem

Testing UICollectionViewCell reuse behavior

Case1: Call the method reloadData directly

Case2: Call the method reloadData inside performBatchUpdates

Case3: Call the method reloadItemsAtIndexPaths directly

Case4: Call the method reloadItemsAtIndexPaths inside performBatchUpdates

Case1: Call the method `reloadData` directly

Case2: Call the method `reloadData` inside `performBatchUpdates`

Case3: Call the method `reloadItemsAtIndexPaths` directly

Case4: Call the method `reloadItemsAtIndexPaths` inside `performBatchUpdates`