UIScrollView+zoomToCenterWithScaleAnimated

UIScrollView+zoomToCenterWithScaleAnimated.h

//
//  UIScrollView+zoomToCenterWithScale.h
//  locationme
//
//  Created by 金燕赖 on 14-6-22.
//  Copyright (c) 2014年 ljy. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface UIScrollView (zoomToCenterWithScaleAnimated)
- (void)zoomToCenter:(CGPoint)center withScale:(CGFloat)scale animated:(BOOL)animated;
@end

UIScrollView+zoomToCenterWithScaleAnimated.m

//
//  UIScrollView+zoomToCenterWithScale.m
//  locationme
//
//  Created by 金燕赖 on 14-6-22.
//  Copyright (c) 2014年 ljy. All rights reserved.
//

#import "UIScrollView+zoomToCenterWithScaleAnimated.h"

@implementation UIScrollView (zoomToCenterWithScale)
- (void)zoomToCenter:(CGPoint)center withScale:(CGFloat)scale animated:(BOOL)animated
{
    CGRect rect;
    rect.size.width = self.frame.size.width / scale;
    rect.size.height = self.frame.size.height / scale;
    rect.origin.x = center.x - (rect.size.width / 2);
    rect.origin.y = center.y - (rect.size.height / 2);
    [self zoomToRect:rect animated:animated];
}
@end