ios简单手势操作-模态视图

最新推荐文章于 2019-04-16 15:55:50 发布

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最新推荐文章于 2019-04-16 15:55:50 发布

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分类专栏： iOS系列文章标签：手势模态视图 ImagePickerControlle TapGestureRecognizer

本文链接：https://blog.youkuaiyun.com/zwf_apple/article/details/17732609

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本文介绍如何在iOS应用中实现图片选择功能。通过创建一个SingleView工程，并利用UIImagePickerController进行图片选取，文章详细展示了从界面搭建到手势识别及图片加载的全过程。

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1.新建一个single view工程

2.ViewController.h

@interface ViewController : UIViewController <UIImagePickerControllerDelegate, UINavigationControllerDelegate> {
    UIImageView *_imgView;//展示图片
}
@end

3.ViewController.m 初始化_imgView

    //初始化image view
    _imgView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 320, 460)];
    _imgView.backgroundColor = [UIColor yellowColor];
    _imgView.userInteractionEnabled = YES;//一定要记得打开图片视图的用户交互
    [self.view addSubview:_imgView];
    [_imgView release];

4.为_imgView添加手势操作

    //手势
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(selectImage)];
//    tap.numberOfTapsRequired = 2;//双击触发
//    tap.numberOfTouchesRequired = 2;//双指触摸触发
    [_imgView addGestureRecognizer:tap];
    [tap release];

5.实现selectImage方法

- (void)selectImage
{
    UIImagePickerController *ipc = [[UIImagePickerController alloc] init];
    ipc.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;//设置从哪里选择图片
    ipc.delegate = self;
    [self presentViewController:ipc animated:YES completion:nil];//模态视图
    [ipc release];
}

6.实现两个代理方法

//选择图片调用
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    _imgView.image = [info objectForKey:UIImagePickerControllerOriginalImage];//
    [self dismissViewControllerAnimated:YES completion:nil];
}

//点击取消调用
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
    [self dismissViewControllerAnimated:YES completion:nil];
}