iOS uses UIScorllView to achieve two-finger scaling function

The two-finger scaling function can not only be implemented using the UIPinchGestureRecognizer gesture, but also using UIScorllView. UIScrollView can easily achieve the maximum and minimum scaling values and scrolling effects. The code is as follows:

#import ""
@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIScrollView *scrollView;
@property (strong, nonatomic) UIImageView *imageView;
@end
@implementation ViewController
- (void)viewDidLoad {
  [super viewDidLoad];
  _scrollView.minimumZoomScale = 1.0;   // Minimum scaling value  _scrollView.maximumZoomScale = 10.0;  // Maximum scaling value  [_scrollView setZoomScale:_scrollView.minimumZoomScale];  // The initial scaling value  _scrollView.delegate = self;
  _imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"image"]];
  _imageView.frame = ;
  [_scrollView addSubview:_imageView];
}
#pragma mark - Returns the control that needs to be scaled- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView {
  return _imageView;
}
- (void)didReceiveMemoryWarning {
  [super didReceiveMemoryWarning];
}
@end

The key point is to call the viewForZoomingInScrollView: proxy method, which returns the control that needs to be scaled.

Demo's GitHub address

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