StackOverflow2013

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plurals

PO
primarykey
Id
12536558
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
4
CommunityOwnedDate
CreationDate
2012-09-21T18:55:30.630
FavoriteCount
0
LastActivityDate
2016-02-08T15:18:15.213
LastEditDate
2016-02-08T15:18:15.213
LastEditorUserId
823013
OwnerUserId
823013
ParentId
11807876
PostTypeId
2
Score
42
ViewCount
0
LastEditorDisplayName
text
Body
You can use QuartzCore to apply a mask (with gradient transparency) to the UIImageView: <pre><code>UIImageView *myImageView = ["the image view"]; CAGradientLayer *l = [CAGradientLayer layer]; l.frame = myImageView.bounds; l.colors = [NSArray arrayWithObjects:(id)[[UIColor colorWithRed:0 green:0 blue:0 alpha:0] CGColor], (id)[[UIColor colorWithRed:0 green:0 blue:0 alpha:1] CGColor], nil]; l.startPoint = CGPointMake(0.0, 0.0f); l.endPoint = CGPointMake(1.0f, 1.0f); //you can change the direction, obviously, this would be top to bottom fade myImageView.layer.mask = l; </code></pre> To save it you can find the answer easily here on Stack Overflow, just by searching for how to save the contents of the canvas to a UIImage. Or Swift version as requested by @Zazu: <pre><code>// Whatever you image view is, obviously not hardcoded like this let imageView = UIImageView.init(image: UIImage(named: "Image")) imageView.frame = CGRectMake(0, 0, 320, 480) self.view.addSubview(imageView) // Create the gradient layer let gradientLayer = CAGradientLayer.init() gradientLayer.frame = imageView.bounds gradientLayer.colors = [ UIColor.init(colorLiteralRed: 0, green: 0, blue: 0, alpha: 0).CGColor, UIColor.init(colorLiteralRed: 0, green: 0, blue: 0, alpha: 1).CGColor] // Whatever direction you want the fade. You can use gradientLayer.locations // to provide an array of points, with matching colors for each point, // which lets you do other than just a uniform gradient. gradientLayer.startPoint = CGPointMake(1.0, 0.0); gradientLayer.endPoint = CGPointMake(0.0, 0.0); // Use the gradient layer as the mask imageView.layer.mask = gradientLayer; </code></pre>
Tags
Title
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. POTransparent (alpha) gradient with Core Graphic iPhone
 singulars
 PostTypePostTypeId
 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USMatthew Horst
UserOwnerUserId
1. USMatthew Horst
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PostLinksRelatedPostIdPostId
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PostsAcceptedAnswerId
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PostsParentIdCreationDate
1. This table or related slice is empty.
VotesPostIdCreationDate
1. VO
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 PO
 UserUserId
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 VoteTypeVoteTypeId
 VTUpMod
2. VO
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 PO
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 VTUpMod
3. VO
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CommentsPostId
1. This table or related slice is empty.

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