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iOS PDFKit Disable vertical scroll bounce

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2

1

How does one disable scroll bounce in a PDFView using PDFKit?

The view where the PDF is shown doesn't have a scroll bounce option.

Here's my code:

if let path = Bundle.main.path(forResource: pdfObject, ofType: "pdf") 
 let url = URL(fileURLWithPath: path)
 if let pdfDocument = PDFDocument(url: url) 

 pdfView.autoresizesSubviews = true
 pdfView.autoresizingMask = [.flexibleWidth, .flexibleHeight,
 .flexibleTopMargin, .flexibleLeftMargin]

 pdfView.autoScales = true
 pdfView.displaysPageBreaks = true
 pdfView.displayDirection = .vertical
 pdfView.displayMode = .singlePageContinuous
 pdfView.document = pdfDocument

 pdfView.maxScaleFactor = 4.0
 pdfView.minScaleFactor = pdfView.scaleFactorForSizeToFit 
 

Thanks in advance (for what is likely a ridiculously simple question!)

ios swift scroll uiscrollview pdfkit

share|improve this question

edited Mar 21 at 21:08

Paulo Mattos

11.5k53855

asked Mar 20 at 15:21

Nicholas FarmerNicholas Farmer

305319

add a comment | 

2

1

How does one disable scroll bounce in a PDFView using PDFKit?

The view where the PDF is shown doesn't have a scroll bounce option.

Here's my code:

if let path = Bundle.main.path(forResource: pdfObject, ofType: "pdf") 
 let url = URL(fileURLWithPath: path)
 if let pdfDocument = PDFDocument(url: url) 

 pdfView.autoresizesSubviews = true
 pdfView.autoresizingMask = [.flexibleWidth, .flexibleHeight,
 .flexibleTopMargin, .flexibleLeftMargin]

 pdfView.autoScales = true
 pdfView.displaysPageBreaks = true
 pdfView.displayDirection = .vertical
 pdfView.displayMode = .singlePageContinuous
 pdfView.document = pdfDocument

 pdfView.maxScaleFactor = 4.0
 pdfView.minScaleFactor = pdfView.scaleFactorForSizeToFit 
 

Thanks in advance (for what is likely a ridiculously simple question!)

ios swift scroll uiscrollview pdfkit

share|improve this question

edited Mar 21 at 21:08

Paulo Mattos

11.5k53855

asked Mar 20 at 15:21

Nicholas FarmerNicholas Farmer

305319

add a comment | 

How does one disable scroll bounce in a PDFView using PDFKit?

The view where the PDF is shown doesn't have a scroll bounce option.

Here's my code:

if let path = Bundle.main.path(forResource: pdfObject, ofType: "pdf") 
 let url = URL(fileURLWithPath: path)
 if let pdfDocument = PDFDocument(url: url) 

 pdfView.autoresizesSubviews = true
 pdfView.autoresizingMask = [.flexibleWidth, .flexibleHeight,
 .flexibleTopMargin, .flexibleLeftMargin]

 pdfView.autoScales = true
 pdfView.displaysPageBreaks = true
 pdfView.displayDirection = .vertical
 pdfView.displayMode = .singlePageContinuous
 pdfView.document = pdfDocument

 pdfView.maxScaleFactor = 4.0
 pdfView.minScaleFactor = pdfView.scaleFactorForSizeToFit 
 

Thanks in advance (for what is likely a ridiculously simple question!)

ios swift scroll uiscrollview pdfkit

share|improve this question

edited Mar 21 at 21:08

Paulo Mattos

11.5k53855

asked Mar 20 at 15:21

Nicholas FarmerNicholas Farmer

305319

if let path = Bundle.main.path(forResource: pdfObject, ofType: "pdf") 
 let url = URL(fileURLWithPath: path)
 if let pdfDocument = PDFDocument(url: url) 

 pdfView.autoresizesSubviews = true
 pdfView.autoresizingMask = [.flexibleWidth, .flexibleHeight,
 .flexibleTopMargin, .flexibleLeftMargin]

 pdfView.autoScales = true
 pdfView.displaysPageBreaks = true
 pdfView.displayDirection = .vertical
 pdfView.displayMode = .singlePageContinuous
 pdfView.document = pdfDocument

 pdfView.maxScaleFactor = 4.0
 pdfView.minScaleFactor = pdfView.scaleFactorForSizeToFit 
 

share|improve this question

edited Mar 21 at 21:08

Paulo Mattos

11.5k53855

asked Mar 20 at 15:21

Nicholas FarmerNicholas Farmer

305319

share|improve this question

edited Mar 21 at 21:08

Paulo Mattos

11.5k53855

asked Mar 20 at 15:21

Nicholas FarmerNicholas Farmer

305319

edited Mar 21 at 21:08

Paulo Mattos

11.5k53855

edited Mar 21 at 21:08

Paulo Mattos

11.5k53855

asked Mar 20 at 15:21

Nicholas FarmerNicholas Farmer

305319

asked Mar 20 at 15:21

Nicholas FarmerNicholas Farmer

305319

1 Answer
1

active

oldest

votes

1

Unfortunately, there isn't an exported API to set the PDFView desired bouncing behavior.

Having said that, you can (safely) exploit a PDFView implementation detail to hack your way around it for now:

extension PDFView 

 /// Disables the PDFView default bouncing behavior.
 func disableBouncing() 
 for subview in subviews 
 if let scrollView = subview as? UIScrollView 
 scrollView.bounces = false
 return
 
 
 print("PDFView.disableBouncing: FAILED!")
 

and then use it like this in your code:

pdfView.disableBouncing()

Caveat. Please keep in mind that such solution might break in future iOS releases. Nevertheless, rest assured your app won't crash as a result (you only won't be disabling the bouncing behavior at all).

share|improve this answer

edited 2 days ago

answered Mar 21 at 20:58

Paulo MattosPaulo Mattos

11.5k53855

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Hi Paulo, thanks for the reply. Unfortunately this doesn't have any effect. However thanks for letting me know I'm not missing a 'bounce' behavior attribute. Might have to wait for an update on PDFKit form apple.
  
  – Nicholas Farmer
  Mar 22 at 13:22
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @NicholasFarmer Hmm... I did a quick test here and was able to successfully disable the bouncing behavior on the PDFView. Will upload a short gist when I get a chance...
  
  – Paulo Mattos
  Mar 22 at 15:24
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Hey @NicholasFarmer, run this code in a Swift Playground in Xcode (be sure the Live View is showing) and you will see that the vertical scroll bouncing is indeed disabled. Comment out the pdfView.disableBouncing() line to enable it back.
  
  – Paulo Mattos
  Mar 22 at 20:24
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Hi Paulo, apologies for the late reply. I went back and re-tested and still didn't work...however after recent update and upgrade to swift 5 - this now works beautifully. Many thanks for your input. Your answer has been accepted and upvoted. Kind regards
  
  – Nicholas Farmer
  2 days ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Hey @NicholasFarmer, glad to hear that ;) Good luck with your app!
  
  – Paulo Mattos
  2 days ago
  

  
  
  
  

add a comment | 

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1

Unfortunately, there isn't an exported API to set the PDFView desired bouncing behavior.

Having said that, you can (safely) exploit a PDFView implementation detail to hack your way around it for now:

extension PDFView 

 /// Disables the PDFView default bouncing behavior.
 func disableBouncing() 
 for subview in subviews 
 if let scrollView = subview as? UIScrollView 
 scrollView.bounces = false
 return
 
 
 print("PDFView.disableBouncing: FAILED!")
 

and then use it like this in your code:

pdfView.disableBouncing()

Caveat. Please keep in mind that such solution might break in future iOS releases. Nevertheless, rest assured your app won't crash as a result (you only won't be disabling the bouncing behavior at all).

share|improve this answer

edited 2 days ago

answered Mar 21 at 20:58

Paulo MattosPaulo Mattos

11.5k53855

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Hi Paulo, thanks for the reply. Unfortunately this doesn't have any effect. However thanks for letting me know I'm not missing a 'bounce' behavior attribute. Might have to wait for an update on PDFKit form apple.
  
  – Nicholas Farmer
  Mar 22 at 13:22
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @NicholasFarmer Hmm... I did a quick test here and was able to successfully disable the bouncing behavior on the PDFView. Will upload a short gist when I get a chance...
  
  – Paulo Mattos
  Mar 22 at 15:24
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Hey @NicholasFarmer, run this code in a Swift Playground in Xcode (be sure the Live View is showing) and you will see that the vertical scroll bouncing is indeed disabled. Comment out the pdfView.disableBouncing() line to enable it back.
  
  – Paulo Mattos
  Mar 22 at 20:24
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Hi Paulo, apologies for the late reply. I went back and re-tested and still didn't work...however after recent update and upgrade to swift 5 - this now works beautifully. Many thanks for your input. Your answer has been accepted and upvoted. Kind regards
  
  – Nicholas Farmer
  2 days ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Hey @NicholasFarmer, glad to hear that ;) Good luck with your app!
  
  – Paulo Mattos
  2 days ago
  

  
  
  
  

add a comment | 

1

Unfortunately, there isn't an exported API to set the PDFView desired bouncing behavior.

Having said that, you can (safely) exploit a PDFView implementation detail to hack your way around it for now:

extension PDFView 

 /// Disables the PDFView default bouncing behavior.
 func disableBouncing() 
 for subview in subviews 
 if let scrollView = subview as? UIScrollView 
 scrollView.bounces = false
 return
 
 
 print("PDFView.disableBouncing: FAILED!")
 

and then use it like this in your code:

pdfView.disableBouncing()

Caveat. Please keep in mind that such solution might break in future iOS releases. Nevertheless, rest assured your app won't crash as a result (you only won't be disabling the bouncing behavior at all).

share|improve this answer

edited 2 days ago

answered Mar 21 at 20:58

Paulo MattosPaulo Mattos

11.5k53855

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Hi Paulo, thanks for the reply. Unfortunately this doesn't have any effect. However thanks for letting me know I'm not missing a 'bounce' behavior attribute. Might have to wait for an update on PDFKit form apple.
  
  – Nicholas Farmer
  Mar 22 at 13:22
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @NicholasFarmer Hmm... I did a quick test here and was able to successfully disable the bouncing behavior on the PDFView. Will upload a short gist when I get a chance...
  
  – Paulo Mattos
  Mar 22 at 15:24
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Hey @NicholasFarmer, run this code in a Swift Playground in Xcode (be sure the Live View is showing) and you will see that the vertical scroll bouncing is indeed disabled. Comment out the pdfView.disableBouncing() line to enable it back.
  
  – Paulo Mattos
  Mar 22 at 20:24
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Hi Paulo, apologies for the late reply. I went back and re-tested and still didn't work...however after recent update and upgrade to swift 5 - this now works beautifully. Many thanks for your input. Your answer has been accepted and upvoted. Kind regards
  
  – Nicholas Farmer
  2 days ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Hey @NicholasFarmer, glad to hear that ;) Good luck with your app!
  
  – Paulo Mattos
  2 days ago
  

  
  
  
  

add a comment | 

Unfortunately, there isn't an exported API to set the PDFView desired bouncing behavior.

Having said that, you can (safely) exploit a PDFView implementation detail to hack your way around it for now:

extension PDFView 

 /// Disables the PDFView default bouncing behavior.
 func disableBouncing() 
 for subview in subviews 
 if let scrollView = subview as? UIScrollView 
 scrollView.bounces = false
 return
 
 
 print("PDFView.disableBouncing: FAILED!")
 

and then use it like this in your code:

pdfView.disableBouncing()

Caveat. Please keep in mind that such solution might break in future iOS releases. Nevertheless, rest assured your app won't crash as a result (you only won't be disabling the bouncing behavior at all).

share|improve this answer

edited 2 days ago

answered Mar 21 at 20:58

Paulo MattosPaulo Mattos

11.5k53855

extension PDFView 

 /// Disables the PDFView default bouncing behavior.
 func disableBouncing() 
 for subview in subviews 
 if let scrollView = subview as? UIScrollView 
 scrollView.bounces = false
 return
 
 
 print("PDFView.disableBouncing: FAILED!")
 

pdfView.disableBouncing()

share|improve this answer

edited 2 days ago

answered Mar 21 at 20:58

Paulo MattosPaulo Mattos

11.5k53855

answered Mar 21 at 20:58

Paulo MattosPaulo Mattos

11.5k53855

answered Mar 21 at 20:58

Paulo MattosPaulo Mattos

11.5k53855