iOS-获取系统的相册图片

在iOS开发中时常会需要调用系统相册中的图片,方法很简单,但是方法很长,由此记录以下.

.h文件中需要导入<MobileCoreServices/MobileCoreServices.h>框架

#import <MobileCoreServices/MobileCoreServices.h>

@interface DetailViewController : UIViewController<UINavigationControllerDelegate,UIImagePickerControllerDelegate>

@end

.m文件中的主要代码:一般在某个按钮的事件方法中填入如下代码

//第一步:判读判断是否能打开系统图库
        if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {
            //第二步:实例化UIImagePickerController对象
            UIImagePickerController *picker = [[UIImagePickerController alloc] init];
            //第三步:告诉picker对象是获取图库资源
            picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
            //第四步:设置代理,需要遵守UINavigationControllerDelegate,UIImagePickerControllerDelegate两个代理
            picker.delegate = self;
            //第五步:设置picker可以编辑
            picker.allowsEditing = YES;
            [self presentViewController:picker animated:YES completion:nil];

UIImagePickerController的代理方法中:

#pragma mark --代理方法UIImagePickerControllerDelegate--
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    //获取选中资源的类型
    NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];
    //kUTTypeImage 系统预置的图片类型的常量
    if ([mediaType isEqualToString:(NSString *)kUTTypeImage]) {
        //代理方法中从info中获取图片 UIImagePickerControllerEditedImage表示图片的关键字
        UIImage *image = [info objectForKey:UIImagePickerControllerEditedImage];
        [_headImage setImage:image forState:UIControlStateNormal];
    }
    [picker dismissViewControllerAnimated:YES completion:nil];
}
//取消选择图片的时候调用该方法
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
    [picker dismissViewControllerAnimated:YES completion:nil];
}

如上就是关于从iOS开发中从图库中中获取图片的相关操作