UIScrollView won't scroll, delegate methods never called

Question

I have several UILabel inside the child view of a UIScrollView . I believe I've set it up exactly like the functioning UIScrollView I have in another view controller, only this one won't scroll. The contentSize is set to larger than the scrollview frame size and scrollview delegate is set to self . The views are wired up in Interface Builder and the UIScrollview has scrolling enabled, bounces, user interaction and multiple touch enabled. The child UIView also has user interaction enabled. Here is my code:

.h file

#import <UIKit/UIKit.h>

@interface CreditsViewController : UIViewController <UIScrollViewDelegate>

@end

.m file

#import "CreditsViewController.h"

@interface CreditsViewController ()
@property (nonatomic, strong) IBOutlet UIScrollView *scrollView;
@property (nonatomic, strong) IBOutlet UIView *contentView;

@end

@implementation CreditsViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.scrollView.delegate = self;
    _scrollView.contentSize = _contentView.frame.size;
    NSLog(@"scrollview frame size, contentview frame size: %f x %f, %f x %f", _scrollView.frame.size.width, _scrollView.frame.size.height, _contentView.frame.size.width, _contentView.frame.size.height);
}
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
NSLog(@"in scrollViewWillBeginDragging");
}

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    NSLog(@"in scrollViewDidScroll");
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}
@end

I get scrollview frame size, contentview frame size: 240.000000 x 128.000000, 320.000000 x 568.000000 as the log printout but I never get the statements from the delegate methods. The scrollview is the only child of the view controller so it should be receiving the touch events when I try to scroll. What's going on?

Answer 1

您需要实现viewForZoomingInScrollView：并返回_contentView。