site_archiver@lists.apple.com Delivered-To: cocoa-dev@lists.apple.com Dkim-signature: v=1; a=rsa-sha1; c=relaxed; d=rols.org; h=from :content-type:subject:date:message-id:to:mime-version; s= rols.org; bh=0/l8Eo8ZCL74bR+gvPowj4d37k8=; b=qVCEvgbgghNPgKQlex/ 2Afl8xWDV9HZYKbvIPj+rQ6dikpU9WUZzZo4xz7c8avV9VaayHm562KQ60tM1Rgj 140PoLx6mN/UxDQNvQS2PitS0yjH7riMPnoby7uyjSCRSLTGTyp7mDjB+M6/e3j4 tBtWzQ0r0ICvHRgJvDoC+6Jg= Domainkey-signature: a=rsa-sha1; c=nofws; d=rols.org; h=from:content-type :subject:date:message-id:to:mime-version; q=dns; s=rols.org; b=I 9yt+T3fyQpwjbSSIszia14/pFXwFElDIXbNRPKg6CVMsnZjMo4vvhD3y8QJI6NUW zHQvhptlAfp7Utl7osCru5DKpp0+X7zmtCzjkylr1dBE2HuUpjmoQPKShD0D4Nl5 /vxc3gthARc60S0pn7CPG9b9asu+fYZRcvxrhTP/Gs= I have a UIView subclass in my iOS app and the content for that UIView is 3 CALayers, each with a bitmap image for their content, added as sublayers of the UIView's layer. Each of the CALayers is the full size of the UIView's layer (they have transparency to composite them together). When the UIView is resized the setFrame: method is called and I have a custom implementation of that which sets the bounds of the sublayers so they again fill the UIView's layer, and draws a new bitmap for each of them of the right size and sets it into their contents. However, when I resize, there's a brief flash of the current content, before it's been redrawn, stretched to fill the new sized window, before the new content replaces it. Nothing I've tried has been able to stop that brief flash and I can't figure out where it's coming from. I've checked that, at the start of the setFrame: method the UIView's layer hasn't already been resized, it hasn't. So before setting the frame bounds and center I've tried removing the content from the sublayers, that didn't work, still flash, I've tried removing the layers totally before sizing the UIView and putting them back at the end after sizing and giving them new content, that didn't work, so this resized drawing doesn't appear to be coming from the UIView's layer. So I looked at the individual 3 layers which have content on them. I can see how, if the bounds change and the content doesn't, the layer will stretch the bitmap to the window, so I've ensure that I call setContent:nil *before* I resize the layer. Of course content is an animatable property as is bounds so it was quite possible the layer is animating the change in bounds and content and starts with a stretched 'old' content, so I turned off animations both by using layer's setActions: method with NSNull for each of the actions contents, orderIn, orderOut, bounds, hidden and sublayers AND I also put the whole thing in a CATransaction into which I've done this to disable actions. [ CATransaction setValue:(id)kCFBooleanTrue forKey:kCATransactionDisableActions ]; and just for good measure I've done one transaction to remove the contents, committed it, then a second transaction to resize the layer and add new content. None of these things have worked, I still see stretched (or compressed) content for a fraction of a second before the content I want is redrawn. I've also turned off autoresizing of subviews all down the line and set the mode to 'redraw', just incase the layers were being resized early, still no good and lastly I've moved the code from setFrame: to layoutSubviews and that makes no difference I'm out of ideas. Perhaps there is something I just fail to understand in the way the model and presentation layers work because certainly in the model no CALayer is resized whilst it still has content set in it, I've printed the bounds of the layer out before I resize it, so I cannot see why the old, now gone, content briefly shows up stretched. _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/site_archiver%40lists.apple... This email sent to site_archiver@lists.apple.com