2014/10/15 下午 10:10:57

iphone Programming Glossary: layer's

Drag UIView around Shape Comprised of CGMutablePaths

http://stackoverflow.com/questions/13664615/drag-uiview-around-shape-comprised-of-cgmutablepaths

pathLayer_.lineJoin kCALineJoinRound self.view.layer addSublayer pathLayer_ Note that we haven't set the path layer's path yet It's too soon to know the path at this time because my view hasn't been laid out at its final size yet. We'll draw..

how to rotate UIIMageVIew with fix point?

http://stackoverflow.com/questions/1414923/how-to-rotate-uiimageview-with-fix-point

wnt to rotate image with fix point.How can i set this fix point iphone share improve this question Set the view's layer's anchorpoint which is in view local coordinates from 0 to 1. That is the top left is 0 0 and the bottom right is 1 1. For..

Changing my CALayer's anchorPoint moves the view

http://stackoverflow.com/questions/1968017/changing-my-calayers-anchorpoint-moves-the-view

position and anchorPoint properties. Basically the position of a layer is specified in terms of the location of the layer's anchorPoint. By default a layer's anchorPoint is 0.5 0.5 which lies at the center of the layer. When you set the position.. Basically the position of a layer is specified in terms of the location of the layer's anchorPoint. By default a layer's anchorPoint is 0.5 0.5 which lies at the center of the layer. When you set the position of the layer you are then setting.. layer. When you set the position of the layer you are then setting the location of the center of the layer in its superlayer's coordinate system. Because the position is relative to the anchorPoint of the layer changing that anchorPoint while maintaining..

What is the best way to create a shadow behind a UIImageView

http://stackoverflow.com/questions/2044479/what-is-the-best-way-to-create-a-shadow-behind-a-uiimageview

a better and easier way to do this. UIImageView inherits from UIView so it has a layer property. You can access the layer's shadow properties and bam you got a shadow. if you have the UIImageView as an IBOutlet to a nib file you can just implement..

Is there a way to pause a CABasicAnimation?

http://stackoverflow.com/questions/2306870/is-there-a-way-to-pause-a-cabasicanimation

share improve this question Recently appeared Apple's technical note QA1673 describes how to pause resume layer's animation. Pause and resume animations listing is below void pauseLayer CALayer layer CFTimeInterval pausedTime layer convertTime..

How to tile the contents of a CALayer?

http://stackoverflow.com/questions/2520978/how-to-tile-the-contents-of-a-calayer

space pattern components CGColorSpaceRelease space CGPatternRelease pattern yourLayer.backgroundColor color set your layer's background to the image CGColorRelease color This code is modified from the GeekGameBoard sample code. share improve this..

UIImageView Gestures (Zoom, Rotate) Question

http://stackoverflow.com/questions/3448614/uiimageview-gestures-zoom-rotate-question

UILongPressGestureRecognizer class return NO return YES Scale and rotation transforms are applied relative to the layer's anchor point this method moves a gesture recognizer's view's anchor point between the user's fingers void adjustAnchorPointForGestureRecognizer..

How do I apply a perspective transform to a UIView?

http://stackoverflow.com/questions/347721/how-do-i-apply-a-perspective-transform-to-a-uiview

improve this question As Ben said you'll need to work with the UIView's layer using a CATransform3D to perform the layer's rotation. The trick to get perspective working as described here is to directly access one of the matrix cells of the CATransform3D..

HTML5 inline video on iPhone vs iPad/Browser

http://stackoverflow.com/questions/3699552/html5-inline-video-on-iphone-vs-ipad-browser

iPhone - flattening a UIImageView and subviews to image = blank image

http://stackoverflow.com/questions/3869692/iphone-flattening-a-uiimageview-and-subviews-to-image-blank-image

UIGraphicsGetCurrentContext renderInContext renders in the coordinate space of the layer so we must first apply the layer's geometry to the graphics context CGContextSaveGState context Center the context around the view's anchor point CGContextTranslateCTM..

How to render to offscreen bitmap then blit to screen using Core Graphics

http://stackoverflow.com/questions/410313/how-to-render-to-offscreen-bitmap-then-blit-to-screen-using-core-graphics

Core Animation CALayer mask animation performance

http://stackoverflow.com/questions/4520941/core-animation-calayer-mask-animation-performance

a sublayer You would just need to make sure your image had the proper alpha and you would use it's CGImageRef as that layer's contents. One other thing. I haven't figured out why yet but I've also noticed performance issues when I apply shouldRasterize..

Reg: modifying layer that is being finalized… [CALayer frame]: message sent to deallocated instance 0xe43c520

http://stackoverflow.com/questions/4956413/reg-modifying-layer-that-is-being-finalized-calayer-frame-message-sen

I've seen this happen when I've accidentally used an accessor to clear a property on a CALayer while within that layer's dealloc method. This may also happen within a UIView's dealloc method if anything display related is updated thus touching..

Show UITabBar when UIViewController pushed

http://stackoverflow.com/questions/5072382/show-uitabbar-when-uiviewcontroller-pushed

to override this method to return an animation from the right instead. To show the tab bar back Cocoa modifies its layer's position property. Therefore our new method should return an animation from the right for the key position and for all the..

What's the best approach to draw lines between views?

http://stackoverflow.com/questions/5847876/whats-the-best-approach-to-draw-lines-between-views

fill it completely with the line's color setting its backgroundColor property to the line's color. Then modify the layer's properties for position bounds transform to make the CALayer cover the exact area of your line. Of course this approach..

How to implement alpha gradient on a image?

http://stackoverflow.com/questions/5908731/how-to-implement-alpha-gradient-on-a-image

. If it's being displayed as the content of a CALayer you could apply an appropriate masking layer to the parent layer's mask property. You could use a CAGradientLayer with appropriate colors to create this mask. You can draw the image to a..

Quartz 2D drawRect method (iPhone)

http://stackoverflow.com/questions/716351/quartz-2d-drawrect-method-iphone

or layer so you may want to force a redraw in this case. setNeedsDisplay will trigger a manual redraw of the view's or layer's content and a subsequent recaching of that content in the layer. For optimal performance it's suggested that you avoid having..