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UIImagePickerController的介绍

概述

本文主要介绍UIImagePickerController的用法以及用例。

UIImagePickerController

UIImagePickerController继承于UINavigationController,主要作用有:拍照、摄像、获取相册(通过设置可区分照片和视频)。

常用属性和方法

罗列出最常用的属性和方法,更详细的请参考苹果官方文档。

sourceType

定义如下:

@property(nonatomic)           UIImagePickerControllerSourceType     sourceType;    // default value is UIImagePickerControllerSourceTypePhotoLibrary.

UIImagePickerControllerSourceType 是一个枚举型:

UIImagePickerControllerSourceTypePhotoLibrary : 照片库 ,默认值

UIImagePickerControllerSourceTypeCamera : 摄像头

UIImagePickerControllerSourceTypeSavedPhotosAlbum : 相簿

mediaTypes

定义如下:

@property(nonatomic,copy)      NSArray<NSString *>  *mediaTypes; // default value is an array containing kUTTypeImage.

媒体类型,默认情况下此数组包含kUTTypeImage,所以拍照时可以不用设置;但是当要录像的时候必须设置,可以设置为kUTTypeVideo(视频,但不带声音)或者kUTTypeMovie(视频并带有声音)

定义如下:

@property(nonatomic) NSTimeInterval   videoMaximumDuration NS_AVAILABLE_IOS(3_1); // default value is 10 minutes.

视频最大录制时长,默认为10 s

videoQuality

定义如下:

@property(nonatomic)  UIImagePickerControllerQualityType videoQuality NS_AVAILABLE_IOS(3_1);         // default value is UIImagePickerControllerQualityTypeMedium. If the cameraDevice does not support the videoQuality, it will use the default value.

视频质量,枚举类型(进行视频压缩时需要使用):

UIImagePickerControllerQualityTypeHigh:高清质量

UIImagePickerControllerQualityTypeMedium:中等质量,适合WiFi传输

UIImagePickerControllerQualityTypeLow:低质量,适合蜂窝网传输

UIImagePickerControllerQualityType640x480:640*480

UIImagePickerControllerQualityTypeIFrame1280x720:1280*720

UIImagePickerControllerQualityTypeIFrame960x540:960*540

showsCameraControls

是否显示摄像头控制面板,默认为YES

cameraOverlayView

摄像头上覆盖的视图,可用通过这个视频来自定义拍照或录像界面

获取相册

我们使用UIImagePickerController最多的一种情况就是获取系统的相册。

初始化UIImagePickerController

最主要的就是初始化UIImagePickerController,下面是具体代码:(显示视频和图片)

- (UIImagePickerController *)imagePickerVC
{
    if (!_imagePickerVC) {
        _imagePickerVC = [[UIImagePickerController alloc] init];
        if (_imagePickerVC.mediaTypes.count < 2) {
            _imagePickerVC.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
            _imagePickerVC.mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:_imagePickerVC.sourceType];
        }
         [_imagePickerVC setSourceType:UIImagePickerControllerSourceTypeSavedPhotosAlbum];
        _imagePickerVC.allowsEditing = YES;
        _imagePickerVC.delegate = self;
    }
    return _imagePickerVC;
}

下面是运行结果截图:

刚进入选择界面:

选择一个图片:

选择一个视频:

项目原码

github下载

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