iOS 中scrollView整個頁面滑動自動居中

iOS 中scrollView整個頁面滑動自動居中。

在iOS中，如果整體的寬度大於單個item的寬度，自動滑動居中則不好用，解決方法如下。寬度還是設置成item的寬度。在 HFScrollViewSuperView上面addsubView。實現原理看代碼就能明白。

HFScrollViewSuperView

#import <UIKit/UIKit.h>

@interface HFScrollViewSuperView : UIView

@property (nonatomic, strong) UIScrollView *scrollView;

@end

#import "HFScrollViewSuperView.h"

@implementation HFScrollViewSuperView

/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    if ([self pointInside:point withEvent:event]) {
        for (UIView *subview in [self.subviews reverseObjectEnumerator]) {
            CGPoint convertedPoint = [subview convertPoint:point fromView:self];
            UIView *hitTestView = [subview hitTest:convertedPoint withEvent:event];
            if ([hitTestView isKindOfClass:[UIButton class]]) {
                return hitTestView;
            }
        }
        return self.scrollView;
    }
    return nil;
}

@end