#import "UIScrollView+PullScale.h"
#import <objc/runtime.h>

@interface UIScrollView ()


@end


static char CorePullScaleImageViewKey;

@implementation UIScrollView (PullScale)

-(void)addPullScaleFuncInVC:(UIViewController *)vc imageUrl:(NSString *)imageUrl originalHeight:(CGFloat)originalHeight hasNavBar:(BOOL)hasNavBar{
    
    CorePullScaleImageView *imageV=[[CorePullScaleImageView alloc] init];
    
    self.imageV=imageV;
    
    imageV.hasNavBar=hasNavBar;
    imageV.originalHeight=originalHeight;
    imageV.imageUrl=imageUrl;
    imageV.vc=vc;

    CGFloat height=originalHeight;

    UIEdgeInsets contentInset=self.contentInset;
    
    contentInset.top+=height;
    self.contentInset=contentInset;

    CGPoint contentOffsett=self.contentOffset;
    
    contentOffsett.y-=height;
    self.contentOffset=contentOffsett;
    [self addSubview:imageV];
}

- (void)resetPullScaleFrame:(CGRect)rect {
    self.imageV.frame = rect;
}


#pragma mark 使用运行时模拟成员变量：imageV
-(void)setImageV:(CorePullScaleImageView *)imageV{
    [self willChangeValueForKey:@"CorePullScaleImageViewKey"];
    objc_setAssociatedObject(self, &CorePullScaleImageViewKey,
                             imageV,
                             OBJC_ASSOCIATION_ASSIGN);
    [self didChangeValueForKey:@"CorePullScaleImageViewKey"];
}


-(CorePullScaleImageView *)imageV{
    return objc_getAssociatedObject(self, &CorePullScaleImageViewKey);
}




@end