delegate

//
//  ViewController.m
//  11-1UiscrollViewdelegate
//
//  Created by zjj on 15/5/13.
//  Copyright (c) 2015年 zjj. All rights reserved.
//

#import "ViewController.h"

@interface ViewController () <UIScrollViewDelegate>
{
    UIImageView *_imgView;
}
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    UIScrollView *scroView = [[UIScrollView alloc]init];
    scroView.frame = self.view.bounds;
    [self.view addSubview:scroView];
    
    UIImage *img = [UIImage imageNamed:@"11.jpg"];
    _imgView = [[UIImageView alloc]initWithImage:img];
    [scroView addSubview:_imgView];
    
    scroView.contentSize = img.size;
    scroView.delegate = self;
    scroView.minimumZoomScale = 0.2;
    scroView.maximumZoomScale = 2;
    
}

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
    return _imgView;
}

@end