uiimageview

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 7 years ago . I am making an app for showing an image gallery in iOS, and I came across two samples. I want to know the differences between Three20

问题 I tried different solutions (e.g. this one), but the color I get back looks a bit different than in the real image. I guess it's because the image is only RGB , not RGBA . May that be an issue? Related issue: if the UIImage has contentMode = .scaleAspectFill , do I have to do a recalculation of the image or can I just use imageView.image ? EDIT: I tried with this extension: extension CALayer { func getPixelColor(point: CGPoint) -> CGColor { var pixel: [CUnsignedChar] = [0, 0, 0, 0] let

问题 I am applying 3D transform on a image layer by follow code. UIImageView *view = (UIImageView *)[recognizer view]; CGPoint translation = [recognizer translationInView:self.view]; CGPoint newCenter = view.center; newCenter.x += translation.x; newCenter.y += translation.y; view.center = newCenter; [recognizer setTranslation:CGPointZero inView:self.view]; Following is the from which the points are converted to transform. UIView+Quadrilateral [self.view transformToFitQuadTopLeft:self

问题 i'm looking to remove an image from my app with a curl up animation. I've got [UIView transitionWithView:sender.view.superview duration:1.5 options:UIViewAnimationOptionTransitionCurlUp animations:^ { [sender.view removeFromSuperview]; } completion:nil]; but this curls the entire page away and looks as though there's a separate page beneath without the image on it. Instead of a 'transition' to a new page is it possible to curl the image off the page without affecting the rest of the page? Do

问题 I have an ImageView with a png and I want to do this: when someone touch this imageview it's alpha change to 0.0, is it possible? (all without buttons) 回答1: Yes, it is possible. For example you can do that with following steps: set image view's userInteractionEnabled property to YES - so it will receive touch events add UITapGestureRecongnizer to it in gesture handler set view's alpha to 0.0, you can do that with animation as well: [UIView animateWithDuration:0.5 animations:^(void){ imageView

问题 How to give animation to UIImageView. I have a following code for animation .but not working for imageview MyImage=[[UIImageView alloc] initWithFrame:CGRectMake(10, 57, 220,140)]; MyImage.image=[UIImage imageNamed:@"image.png"]; MyImage.userInteractionEnabled = YES; [self.view addSubview:MyImage]; [UIView beginAnimations : nil context : nil]; [UIView setAnimationCurve : UIViewAnimationCurveLinear]; [UIView setAnimationDuration : 1.00]; UIView setAnimationTransition :

问题 in the current project I have a number of folders, with subfolders, and these contain images: 01.png, 02.png. Folder1/FolderA/f1.png Folder1/FolderB/F1.png When I compile the app, I looked inside the the .app and noticed that all the images are placed in the top level, with no sub-folders. So clearly when trying to load the image this doesn't work: NSString *filePath = [[NSBundle mainBundle] pathForResource:@"f1" ofType:@"png" inDirectory:@"Folder1/FolderA"]; But even more strangely, when

问题 I am using UItextview and adding an extra inputAccessoryview for toolbar buttons to perform additional actions. My toolbar has a camera icon which gets the image from UIImagePickerController and Ι have to add this image in my UItextview . Right now Ι am able to do this with : [myTextView addSubView:imageView]; But that way, always adds the image at the beginning of the textview and what Ι want is to add it at the current cursor location. I would also like to remove this image just like I

问题 I am using UItextview and adding an extra inputAccessoryview for toolbar buttons to perform additional actions. My toolbar has a camera icon which gets the image from UIImagePickerController and Ι have to add this image in my UItextview . Right now Ι am able to do this with : [myTextView addSubView:imageView]; But that way, always adds the image at the beginning of the textview and what Ι want is to add it at the current cursor location. I would also like to remove this image just like I

问题 @interface UIDraggableImageView : UIImageView { } .m file - (void) touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event { // Retrieve the touch point CGPoint point = [[touches anyObject] locationInView:self]; startLocation = point; [[self superview] bringSubviewToFront:self]; } - (void)touchesMoved:(NSSet*)touches withEvent:(UIEvent*)event { // Move relative to the original touch point CGPoint point = [[touches anyObject] locationInView:self]; CGRect frame = [self frame]; frame.origin.x +=