uiimageview

问题 In my application I'm downloading some images using the URL and put them in the cell.imageView[indexPath.row] (it's a custom cell with an imageView inside). I can see two cells at a time and I noticed that the method func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> CustomCell { } It's called every time the cell will be displayed. So my app continue to download the image from the server and the app result very slow. I would like to know if it's possible

问题 If I have an imageview of 77x77 and I want to adapt an UIImage in this imageview, is it possible? at the example I want set in this imageview an image with a size of 300x200, is there a way to adapt this image inside this imageview (77x77) ?? thanks 回答1: Yes, myImageView.contentMode = UIViewContentModeScaleAspectFit; The property is inherited from UIView. UIViewContentMode Specifies how a view adjusts its content when its size changes. typedef enum { UIViewContentModeScaleToFill,

问题 I have drawn a straight line on UIImageView. Now I want to remove that drawn line if user taps on it. Here is my code for drawing a line on Image. - (void)handleLongPressGestures:(UILongPressGestureRecognizer *)sender { if (sender.state == UIGestureRecognizerStateEnded) { CGPoint location=[sender locationInView:imageView]; CGPoint contextLocation = CGPointMake(location.x*imageView.image.size.width/imageView.frame.size.width, location.y*imageView.image.size.height/imageView.frame.size.height);

问题 I have set a cell image to my UITableViewCell . It is a custom cell. I have set the aspect ratio as 1:1 and the width of the image view to 50. But for iphone 5 and 5s this size is too big as I feel. So how can I change the size of the UIImageView relative to the screen width. Please help me. Thanks This is my current view 回答1: There are at least 2 ways you could configure image size based on the screen size: Size-Classes allows you to set different width constraint value based on Trait

问题 I have response from soap as image_path (self.posts.value(forKey: "image_path") as! [String])[indexPath.row] This is my response "http://sf.iipl.info/ImageCSharp.aspx?Location=C:\\infinityhost\\demo11.iipl.info\\data\\app\\user_location_photo\\8000034939_Resize\\&FileName=1_35f28e55-ca31-4918-8b41-9eb7f3070ace" i cant convert this response to my url, i want to show this image in my tableViewCell public func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) ->

问题 I have two imageViews that I call firstView and secondView; I have to do an animation that move a third imageView that I call imageView3. This imageView3 is inside firstView and I do this code [UIView beginAnimations:nil context:NULL]; [UIView setAnimationDuration:0.5]; [imageView3 setFrame:frameinSecondView]; [UIView commitAnimations]; //[imageView3 removeFromSuperview]; //[secondView addSubview:imageView3]; with this code I can move imageView3 to secondView but the problem is that I'm not

问题 The below code is not displaying the image which is downloaded from online and written into my application documents directory. i have checked inside the iphone's simulator documents directory , the downloaded file is exist. but the image is not displayed. When trying to add a resources image using UIImage *imgBack = [UIImage imageNamed:@"btn-back.png"]; , the uiimageview displays the image.bu the image which is downloaded from online and stored inside the app directory is not displaying the

问题 when I use: ImageView.transform = CGAffineTransformRotate(ImageView.transform, rotation); everytime I rotate imageView and I NSLog(@"x:%f y:%f", ImageView.frame.orgin.x, ImageView.frame.orgin.y), x and y always change value?? Why? 回答1: Well the .frame.origin is the top left corner of you UIImageView and since you are rotating it the top left corner is moving. If you access the .center it should stay the same. 回答2: The UIView documentation states that Warning: If this property is not the

问题 I have created a NSArray that contains images objects. Based on the swipe direction recognized by UISwipeGestureRecognizerDirection the index is incremented up or down so the right image could be selected. The problem I have is that my NSArray is returning a NULL value instead of the image object. Therefore the UIImageView (named imageView) displays nothing. I am printing an NSLog statement in order to see what is really happening - example below: ... [2307:60b] Swiped and the index is: 1,

问题 My app has a camera section. It takes a photo and then puts a watermark on the photo. However when the photo is saved, the whole screen is saved, not just the UIImageView . I just want the UIImageView to be saved. It's not that but because the menu bar at the button is not that big. I just think it would look better without the menu bar in the picture. Photo of app just before taking photo: Photo of how the picture taken is saved: This is my code below. import UIKit class Camera: