Crop UIView Snapshot
I'm implementing a custom UINavigationViewController transition, and as part of the animation I want to snapshot and transform the destination UIViewController. However, I want to slice the snapshot and transform the parts independently.
There is a comment in UIView.h that seems to indicate that this is possible and even recommended:
Creating snapshots from existing snapshots (as a method to duplicate, crop or create a resizable variant) is supported. In cases where many snapshots are needed, creating a snapshot from a common superview and making subsequent snapshots from it can be more performant.
However, I cannot figure out how to actually do the cropping or create multiple snapshots from the common superview snapshot.
Is this possible?
Note: I did investigate using UIView.drawHierarchy(in:afterScreenUpdates:) to create an image that I can later crop, however this fails during a UINavigationController transition with the following error:
[Snapshotting] View (0x140853600, MTKView) drawing with afterScreenUpdates:YES inside CoreAnimation commit is not supported.
ios uiview
asked Nov 13 '18 at 20:39
JaysonJayson
757620
add a comment |
I'm implementing a custom UINavigationViewController transition, and as part of the animation I want to snapshot and transform the destination UIViewController. However, I want to slice the snapshot and transform the parts independently.
There is a comment in UIView.h that seems to indicate that this is possible and even recommended:
Creating snapshots from existing snapshots (as a method to duplicate, crop or create a resizable variant) is supported. In cases where many snapshots are needed, creating a snapshot from a common superview and making subsequent snapshots from it can be more performant.
However, I cannot figure out how to actually do the cropping or create multiple snapshots from the common superview snapshot.
Is this possible?
Note: I did investigate using UIView.drawHierarchy(in:afterScreenUpdates:) to create an image that I can later crop, however this fails during a UINavigationController transition with the following error:
[Snapshotting] View (0x140853600, MTKView) drawing with afterScreenUpdates:YES inside CoreAnimation commit is not supported.
ios uiview
asked Nov 13 '18 at 20:39
JaysonJayson
757620
add a comment |
I'm implementing a custom UINavigationViewController transition, and as part of the animation I want to snapshot and transform the destination UIViewController. However, I want to slice the snapshot and transform the parts independently.
There is a comment in UIView.h that seems to indicate that this is possible and even recommended:
Creating snapshots from existing snapshots (as a method to duplicate, crop or create a resizable variant) is supported. In cases where many snapshots are needed, creating a snapshot from a common superview and making subsequent snapshots from it can be more performant.
However, I cannot figure out how to actually do the cropping or create multiple snapshots from the common superview snapshot.
Is this possible?
Note: I did investigate using UIView.drawHierarchy(in:afterScreenUpdates:) to create an image that I can later crop, however this fails during a UINavigationController transition with the following error:
[Snapshotting] View (0x140853600, MTKView) drawing with afterScreenUpdates:YES inside CoreAnimation commit is not supported.
ios uiview
asked Nov 13 '18 at 20:39
JaysonJayson
757620
I'm implementing a custom UINavigationViewController transition, and as part of the animation I want to snapshot and transform the destination UIViewController. However, I want to slice the snapshot and transform the parts independently.
There is a comment in UIView.h that seems to indicate that this is possible and even recommended:
Creating snapshots from existing snapshots (as a method to duplicate, crop or create a resizable variant) is supported. In cases where many snapshots are needed, creating a snapshot from a common superview and making subsequent snapshots from it can be more performant.
However, I cannot figure out how to actually do the cropping or create multiple snapshots from the common superview snapshot.
Is this possible?
Note: I did investigate using UIView.drawHierarchy(in:afterScreenUpdates:) to create an image that I can later crop, however this fails during a UINavigationController transition with the following error:
[Snapshotting] View (0x140853600, MTKView) drawing with afterScreenUpdates:YES inside CoreAnimation commit is not supported.
ios uiview
ios uiview
asked Nov 13 '18 at 20:39
JaysonJayson
757620
asked Nov 13 '18 at 20:39
JaysonJayson
757620
edited Nov 13 '18 at 20:45
Jayson
asked Nov 13 '18 at 20:39
JaysonJayson
757620
asked Nov 13 '18 at 20:39
JaysonJayson
757620
asked Nov 13 '18 at 20:39
JaysonJayson
757620
757620
add a comment |
add a comment |
1 Answer
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Thanks to KMT over at the Apple forums, I found the solution:
UIView.resizableSnapshotView(from:afterScreenUpdates:withCapInsets:)
Passing in the desired cropping rect and UIEdgeInsets.zero for the cap insets correctly creates a cropped snapshot.
answered Nov 14 '18 at 19:07
JaysonJayson
757620
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Thanks to KMT over at the Apple forums, I found the solution:
UIView.resizableSnapshotView(from:afterScreenUpdates:withCapInsets:)
Passing in the desired cropping rect and UIEdgeInsets.zero for the cap insets correctly creates a cropped snapshot.
answered Nov 14 '18 at 19:07
JaysonJayson
757620
add a comment |
Thanks to KMT over at the Apple forums, I found the solution:
UIView.resizableSnapshotView(from:afterScreenUpdates:withCapInsets:)
Passing in the desired cropping rect and UIEdgeInsets.zero for the cap insets correctly creates a cropped snapshot.
answered Nov 14 '18 at 19:07
JaysonJayson
757620
add a comment |
Thanks to KMT over at the Apple forums, I found the solution:
UIView.resizableSnapshotView(from:afterScreenUpdates:withCapInsets:)
Passing in the desired cropping rect and UIEdgeInsets.zero for the cap insets correctly creates a cropped snapshot.
answered Nov 14 '18 at 19:07
JaysonJayson
757620
Thanks to KMT over at the Apple forums, I found the solution:
UIView.resizableSnapshotView(from:afterScreenUpdates:withCapInsets:)
Passing in the desired cropping rect and UIEdgeInsets.zero for the cap insets correctly creates a cropped snapshot.
answered Nov 14 '18 at 19:07
JaysonJayson
757620
answered Nov 14 '18 at 19:07
JaysonJayson
757620
answered Nov 14 '18 at 19:07
JaysonJayson
757620
answered Nov 14 '18 at 19:07
JaysonJayson
757620
757620
add a comment |
add a comment |
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