uiimageview

问题 I'm a beginner with swift and I can't get the resize of a UIImageView working. Here is my current layout : What I want is to resize the images to occupy half the screen's width (2 images per row). Here is my storyboard : Here is the function drawing the collection view inside my controller : func collectionView(collectionView: UICollectionView!, cellForItemAtIndexPath indexPath: NSIndexPath!) -> UICollectionViewCell! { var cell : MenuInspirationCellView = collectionView

问题 I want UIAlertController to present an alert with UIImageView in an ActionSheet . But when I run the application it is terminating. This is my code: UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"Title" message:@"Welcome" preferredStyle:UIAlertControllerStyleAlert]; UIAlertAction *okButton = [UIAlertAction actionWithTitle:OK style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) { }]; [alert addAction:okButton]; UIImageView *imgv = [[UIImageView alloc

问题 I have a small IPhone app that I am working on and I am displaying an image with a UIImageView. I am scaling it up using the Aspect Fit mode. I would like to have the image scale up with no interpolation/smoothing (I want it to look pixellated). Is there any way I can change this behavior? A little more general question would be can I implement my own scaling algorithm, or are there other built in ones that I can select? 回答1: You would need to set the magnificationFilter property on the view

问题 I'm using SDWebImage for showing images inside cells. But it is perfect mached to frame of UImageView that I'm doing in code below: NSString * s =[NSString stringWithFormat:@"url of image to show"]; NSURL *url = [NSURL URLWithString:s]; [cell.shopImageView sd_setImageWithURL:url]; My UIImageView is size 50x50. For example image from url is size 990x2100 and my image is not displaying well in the frame given. In this case when hight is bigger, I want to resize my image by proper height ratio

问题 I am creating the UIImageView using interface Builder. Its frame size is (320,67). I want to display the image on the imageView. I am getting the image from the web. The problem is that the image get from web is stretched to display on the imageview... Here my code NSData *imageData=[NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://www.isco.com/webproductimages/appBnr/bnr1.jpg"]]; imageView.image = [UIImage imageWithData:imageData]; Can anyone tel me that how to display the image

问题 I have a UIImageView and a UILabel, and want the content of the UILabel to mask the UIImageView. The goal is that the text is visible with content of image but everything else transparent. Is there a simple way to mask a view by the contents of another view? 回答1: You can use QuartzCore Framework . (Link project with QuartzCore.framework and import <QuartzCore/QuartzCore.h>). @import QuartzCore; Background of label must be clear color. Example: self.imageView.layer.mask = self.label.layer;

问题 I'm trying this code (found in an answer here on SO) in a category on UIView and am using it to peform a "pop" animation on a UIImageView nested inside of a UITableViewCell. - (void)attachPopUpAnimation { CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"transform"]; CATransform3D scale1 = CATransform3DMakeScale(0.5, 0.5, 1); CATransform3D scale2 = CATransform3DMakeScale(1.2, 1.2, 1); CATransform3D scale3 = CATransform3DMakeScale(0.9, 0.9, 1); CATransform3D scale4 =

问题 I'm subclassing UIImageView to create a tile-based application. Essentially, I am taking a single image file and breaking it up into pieces, and then assigning the pieces to my tiles ( UIImageViews ), so that they can be manipulated independently. What's the best way to grab a portion of an image and use that to draw a UIImageView ? I thought about overriding drawRect and using CGAffineTransform , but it seems like there ought to be a simpler way to do this, perhaps by specifying a CGRect to

问题 I'm subclassing UIImageView to create a tile-based application. Essentially, I am taking a single image file and breaking it up into pieces, and then assigning the pieces to my tiles ( UIImageViews ), so that they can be manipulated independently. What's the best way to grab a portion of an image and use that to draw a UIImageView ? I thought about overriding drawRect and using CGAffineTransform , but it seems like there ought to be a simpler way to do this, perhaps by specifying a CGRect to

问题 I've a UIImageView with a image with is a car with a transparent background: And I want to draw a border around the car: How can I reach this effect? At the moment, I've tested CoreGraphics in this way, but without good results: // load the image UIImage *img = carImage; UIGraphicsBeginImageContext(img.size); CGContextRef context = UIGraphicsGetCurrentContext(); [[UIColor redColor] setFill]; CGContextTranslateCTM(context, 0, img.size.height); CGContextScaleCTM(context, 1.0, -1.0);