一行代码打开相册/相机

立即下载用AI写一个

发布时间：2017-09-08

3人 | 浏览：4420次 | 收藏 |

技术：object-c

概述

当我们想要打开相机/相册的时候，如果是没有授权过的话，那么就会弹出这样的界面，是不是很丑啊，所以QQ等应用在没有授权的时候，会弹出一个Alert来提醒用户，没有打开权限，这样既可以告诉用户如何打开界面，又可以不显示这种未授权的界面样式，提高了用户的体验。

详细

#### 一、前言
当我们想要打开相机/相册的时候，如果是没有授权过的话，那么就会弹出这样的界面，是不是很丑啊，所以QQ等应用在没有授权的时候，会弹出一个Alert来提醒用户，没有打开权限，这样既可以告诉用户如何打开界面，又可以不显示这种未授权的界面样式，提高了用户的体验。

![相册未授权界面](/contentImages/image/jianshu/1727268-f472d1d74738dff2.png)

![相机未授权界面](/contentImages/image/jianshu/1727268-e8547f0ab511fcc8.png)

#### 二、效果图：

![效果图.gif](/contentImages/image/jianshu/1727268-2c4b9b028fdf181b.gif)

#### 三、代码实现：
只需要一行代码即可打开相册/相机ViewController.m文件
```
#import "ViewController.h"
#import "CFLibraryAndCamera.h"

#define kScreen [UIScreen mainScreen].bounds.size

@interface ViewController () <CFLibraryAndCameraDelegate>

@property (nonatomic,strong) CFLibraryAndCamera *libraryandCamera;
@property (nonatomic,strong) UIImageView *bgimv;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.title = @"权限问题";
    self.view.backgroundColor = [UIColor whiteColor];
    
    _bgimv = [[UIImageView alloc]init];
    _bgimv.center = CGPointMake(kScreen.width*0.5, 164+30);
    _bgimv.bounds = CGRectMake(0, 0, 200, 200);
    _bgimv.backgroundColor = [UIColor grayColor];
    _bgimv.contentMode = UIViewContentModeScaleAspectFit;
    [self.view addSubview:_bgimv];
    
    UIButton *picBtn = [[UIButton alloc]initWithFrame:CGRectMake(30, kScreen.height-150, kScreen.width-60, 50)];
    [picBtn setTitle:@"选取照片" forState:UIControlStateNormal];
    picBtn.backgroundColor = [UIColor blueColor];
    [picBtn addTarget:self action:@selector(picBtnClike) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:picBtn];
    
    UIButton *creamBtn = [[UIButton alloc]initWithFrame:CGRectMake(30, kScreen.height-90, kScreen.width-60, 50)];
    [creamBtn setTitle:@"选取相机" forState:UIControlStateNormal];
    creamBtn.backgroundColor = [UIColor blueColor];
    [creamBtn addTarget:self action:@selector(creamBtnClike) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:creamBtn];

}

#pragma mark - 自己创建的方法
//懒加载创建
-(CFLibraryAndCamera *)libraryandCamera
{
    if (!_libraryandCamera) {
        _libraryandCamera = [[CFLibraryAndCamera alloc]init];
        _libraryandCamera.delegate = self;
        _libraryandCamera.allowsEditing = YES;
    }
    return _libraryandCamera;
}

//打开相册
-(void)picBtnClike{
    [self.libraryandCamera picBtnClike:self];
}

//打开相机
-(void)creamBtnClike{
    [self.libraryandCamera cameraBtnClike:self];
}

//消失界面
-(void)dismissLibraryAndCameraPickingImage:(UIImage *)image editingInfo:(NSDictionary<NSString *,id> *)editingInfo
{
    _bgimv.image = image;
}

//选择界面取消按钮点击
-(void)didCancel
{
    NSLog(@">>>>>>>>>");
}
```
只需要懒加载创建一个对象，然后调用对象的打开相册/相机方法即可
CFLibraryAndCamera.h文件
```
#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>

@protocol CFLibraryAndCameraDelegate <NSObject>

//消失界面
-(void)dismissLibraryAndCameraPickingImage:(UIImage *)image editingInfo:(NSDictionary<NSString *,id> *)editingInfo;
//选择界面取消按钮点击
-(void)didCancel;

@end

//导入相册库 iOS7
#import <AssetsLibrary/AssetsLibrary.h>
//导入相册库 iOS8
#import <Photos/Photos.h>
//iOS10要在plist文件中增加
//<key>NSPhotoLibraryUsageDescription</key>
//<string>App需要您的同意,才能访问相册</string>

//导入相机框架
#import <AVFoundation/AVFoundation.h>
//iOS10要在plist文件中增加
//<key>NSCameraUsageDescription</key>
//<string>App需要您的同意,才能访问相机</string>

@interface CFLibraryAndCamera : NSObject <UIImagePickerControllerDelegate,UINavigationControllerDelegate>

@property (nonatomic,strong) UIImagePickerController *imgPickerVC;
@property (nonatomic,assign)id <CFLibraryAndCameraDelegate> delegate;

/** 打开相册 */
-(void)picBtnClike:(UIViewController *)viewController;

/** 打开相机 */
-(void)cameraBtnClike:(UIViewController *)viewController;

/** 图片是否编辑 */
@property (nonatomic,assign,getter=isAllowsEditing) BOOL allowsEditing;

/** 判断设备是否有摄像头 */
-(BOOL)isCameraAvailable;

/** 前面的摄像头是否可用 */
-(BOOL)isFrontCameraAvailable;

/** 后面的摄像头是否可用 */
-(BOOL)isRearCameraAvailable;
```
CFLibraryAndCamera.m文件
```
#import "CFLibraryAndCamera.h"

@interface CFLibraryAndCamera()

@end

@implementation CFLibraryAndCamera

-(UIImagePickerController *)imgPickerVC
{
    if (!_imgPickerVC) {
        _imgPickerVC = [[UIImagePickerController alloc]init];
        _imgPickerVC.delegate = self;
    }
    return _imgPickerVC;
}

#pragma mark - 属性设置
-(void)setAllowsEditing:(BOOL)allowsEditing
{
    _allowsEditing = allowsEditing;
    self.imgPickerVC.allowsEditing = _allowsEditing;
}

#pragma mark - 摄像头和相册相关的公共类
// 判断设备是否有摄像头
-(BOOL)isCameraAvailable{
    return [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera];
}

// 前面的摄像头是否可用
-(BOOL)isFrontCameraAvailable{
    return [UIImagePickerController isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceFront];
}

// 后面的摄像头是否可用
-(BOOL)isRearCameraAvailable{
    return [UIImagePickerController isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceRear];
}

/** 打开相机 */
-(void)cameraBtnClike:(UIViewController *)viewController{
    //判断相机是否可用
    if (![self isCameraAvailable]) {
        [self showAlertViewTitle:@"温馨提示" message:@"相机不可用" viewController:viewController];
        return;
    }
    
    AVAuthorizationStatus status = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
    /*
     AVAuthorizationStatusNotDetermined  不确定(第一次打开)
     AVAuthorizationStatusRestricted  受限制
     AVAuthorizationStatusDenied  拒绝
     AVAuthorizationStatusAuthorized  经授权
     */
    if (status == AVAuthorizationStatusRestricted || status == AVAuthorizationStatusDenied) {
        [self showAlertViewTitle:@"没有相机访问权限" message:@"请到设置中心设置权限\n设置->隐私->相机" viewController:viewController];
    }
    
    //打开相机
    self.imgPickerVC.sourceType = UIImagePickerControllerSourceTypeCamera;
    [viewController presentViewController:self.imgPickerVC animated:YES completion:nil];
}

/** 打开相册 */
-(void)picBtnClike:(UIViewController *)viewController{
    if ([[[UIDevice currentDevice] systemVersion] floatValue] <8.0) {
        //iOS7
        ALAuthorizationStatus status = [ALAssetsLibrary authorizationStatus];
        /*
         ALAuthorizationStatusNotDetermined  不确定(第一次打开)
         ALAuthorizationStatusRestricted  受限制
         ALAuthorizationStatusDenied  拒绝
         ALAuthorizationStatusAuthorized  经授权
         */
        if (status == ALAuthorizationStatusRestricted || status ==ALAuthorizationStatusDenied) {
            [self showAlertViewTitle:@"没有相册访问权限" message:@"请到设置中心设置权限\n设置->隐私->相机" viewController:viewController];
        }
        
    }else{
        //iOS7以上
        PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];
        /*
         PHAuthorizationStatusNotDetermined  不确定(第一次打开)
         PHAuthorizationStatusRestricted  受限制
         PHAuthorizationStatusDenied  拒绝
         PHAuthorizationStatusAuthorized  经授权
         */
        if (status == PHAuthorizationStatusRestricted || status == PHAuthorizationStatusDenied) {
            [self showAlertViewTitle:@"没有相册访问权限" message:@"请到设置中心设置权限\n设置->隐私->照片" viewController:viewController];
        }
    }
    
    //打开相册
    self.imgPickerVC.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    [viewController presentViewController:self.imgPickerVC animated:YES completion:nil];
}

/**
 只带确定的alertView简单弹框
 
 @param titleStr 标题
 @param message 内容
 */
-(void)showAlertViewTitle:(NSString *)titleStr message:(NSString *)message viewController:(UIViewController *)viewController{
    if ([[[UIDevice currentDevice] systemVersion] floatValue] <8.0) {
        //iOS7
        UIAlertView *alert = [[UIAlertView alloc]initWithTitle:titleStr message:message delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];
        [alert show];
        return;
        
    }else{
        //iOS7以上
        UIAlertController *alert = [UIAlertController alertControllerWithTitle:titleStr message:message preferredStyle:UIAlertControllerStyleAlert];
        [alert addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
            
        }]];
        //显示
        [viewController presentViewController:alert animated:YES completion:nil];
        return;
    }
}

#pragma mark - UIImagePickerControllerDelegate
/** 选取图片后执行方法 */
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(nullable NSDictionary<NSString *,id> *)editingInfo
{
    NSLog(@"%p",picker);
    [picker dismissViewControllerAnimated:YES completion:nil];
    [self.delegate dismissLibraryAndCameraPickingImage:image editingInfo:editingInfo];
}

/** 点击取消执行方法 */
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
    [picker dismissViewControllerAnimated:YES completion:nil];
    [self.delegate didCancel];
}
```
##### 如果需要更改提示的内容，就在CFLibraryAndCamera.m文件中修改提示内容

#### 四、代码结构截图：
> 第一层目录结构

![](/contentImages/image/20170908/UP11x3G8OG3OuMh9dya.png)

> 第二层目录结构

![](/contentImages/image/20170908/IDJginHBYhr4UCxxmWg.png)

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