//
//  RootViewController.m
//  ScrollView
//
//  Copyright (c) 2014年 Y.X. All rights reserved.
//

#import "RootViewController.h"@interface RootViewController ()<UIScrollViewDelegate>{BOOL tapped;
}@property (nonatomic, strong) UIScrollView           *scrollView;
@property (nonatomic, strong) UIImageView            *imageView;
@property (strong, nonatomic) UITapGestureRecognizer *tapGesture;@end@implementation RootViewController- (void)viewDidLoad
{[super viewDidLoad];self.view.backgroundColor = [UIColor blackColor];// scrollView
    {_scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 200, 200)];[self.view addSubview:_scrollView];_scrollView.center              = self.view.center;_scrollView.delegate            = self;_scrollView.layer.borderWidth   = 2.f;_scrollView.layer.borderColor   = [UIColor redColor].CGColor;_scrollView.layer.masksToBounds = NO;// 不显示滚动的条_scrollView.showsHorizontalScrollIndicator = NO;_scrollView.showsVerticalScrollIndicator   = NO;_scrollView.bouncesZoom      = YES;_scrollView.minimumZoomScale = 1.f;_scrollView.maximumZoomScale = 10.f;_scrollView.contentMode      = UIViewContentModeScaleAspectFit;}// 图片_imageView       = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 200, 200)];_imageView.image = [UIImage imageNamed:@"back"];_imageView.contentMode = UIViewContentModeScaleAspectFit;[_scrollView addSubview:_imageView];// 手势_tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:selfaction:@selector(tapRecognized:)];[_scrollView addGestureRecognizer:_tapGesture];
}- (void)tapRecognized:(id)sender
{if (!tapped){CGPoint tapPoint = [self.tapGesture locationOfTouch:0inView:self.tapGesture.view];CGRect zoomRect = [self zoomRectForScrollView:self.scrollViewwithScale:6.0fwithCenter:tapPoint];[self.scrollView zoomToRect:zoomRect animated:YES];tapped = YES;}else{[self.scrollView setZoomScale:1.0f animated:YES];tapped = NO;}
}- (CGRect)zoomRectForScrollView:(UIScrollView *)scrollViewwithScale:(float)scalewithCenter:(CGPoint)center
{CGRect zoomRect;zoomRect.size.height = scrollView.frame.size.height / scale;zoomRect.size.width  = scrollView.frame.size.width / scale;zoomRect.origin.x    = center.x - (zoomRect.size.width / 2.0);zoomRect.origin.y    = center.y - (zoomRect.size.height / 2.0);return zoomRect;
}#pragma mark - UIScrollView代理方法
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{return self.imageView;
}@end