圖像未填充整個uiimageview的寬度和高度

Question

我有以下代碼：

UIGraphicsBeginImageContext(CGSizeMake(self.captureImageView.frame.size.width, self.captureImageView.frame.size.height));
[image drawInRect: CGRectMake(0, 0, self.captureImageView.frame.size.width, self.captureImageView.frame.size.height)];
UIImage *smallImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();       
CGRect cropRect = CGRectMake(0, 0, self.captureImageView.frame.size.width, self.captureImageView.frame.size.height);
CGImageRef imageRef = CGImageCreateWithImageInRect([smallImage CGImage], cropRect);

[self.captureImageView setImage:[UIImage imageWithCGImage:imageRef]];

CGImageRelease(imageRef);

//rotation
[UIView beginAnimations:@"rotate" context:nil];
[UIView setAnimationDuration:0.5];
int degrees = [self rotationDegrees];
CGFloat radians =degrees * M_PI / 180.0;
self.captureImageView.transform = CGAffineTransformMakeRotation(radians);
[UIView commitAnimations];

在橫向模式下捕獲圖像時，向左或向右顯示的uiimageview中的圖像沒有填充整個frame.size，並且始終為“短”

可以指出我的代碼要修復/添加的內容嗎？

Answer 1

將圖像視圖的內容模式設置為填充 （ 參考 ）：

self.captureImageView.contentMode = UIViewContentModeScaleToFill;

Answer 2

假設您正在使用自動布局，則要確保將圖像固定在超級視圖的側面（在IB或代碼中，如下所示）。

您還需要像在IB或代碼中提到的@trojanfoe一樣設置contentMode 。 我正在使用UIViewContentModeScaleAspectFit （而不是UIViewContentModeScaleToFill ）來保留圖像的長寬比。

imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:imageName]];
imageView.contentMode = UIViewContentModeScaleAspectFit;
imageView.translatesAutoresizingMaskIntoConstraints = NO;
[self addSubview:imageView];
NSArray *horzConstraints =
  [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-(0)-[imageView]-(0)-|"
                                          options: NSLayoutFormatAlignAllCenterX
                                          metrics:nil
                                            views:@{@"imageView" : imageView}];
NSArray *vertConstraints =
  [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-(0)-[imageView]-(0)-|"
                                          options: NSLayoutFormatAlignAllCenterY
                                          metrics:nil
                                            views:@{@"imageView" : imageView}];
[self addConstraints:horzConstraints];
[self addConstraints:vertConstraints];

注意： self是此代碼段中imageView的imageView視圖。