代码地址如下：

http://www.demodashi.com/demo/11634.html

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。

二、效果图：

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 () 
    
     @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
     
       *)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 
    
     #import 
     
      @protocol CFLibraryAndCameraDelegate 
      
       //消失界面-(void)dismissLibraryAndCameraPickingImage:(UIImage *)image editingInfo:(NSDictionary
       
         *)editingInfo;//选择界面取消按钮点击-(void)didCancel;@end//导入相册库 iOS7#import 
        
         //导入相册库 iOS8#import 
         
          //iOS10要在plist文件中增加//
          
           NSPhotoLibraryUsageDescription
          //
          
           App需要您的同意,才能访问相册
          //导入相机框架#import 
          
           //iOS10要在plist文件中增加//
           
            NSCameraUsageDescription
           //
           
            App需要您的同意,才能访问相机
           @interface CFLibraryAndCamera : NSObject 
           
            @property (nonatomic,strong) UIImagePickerController *imgPickerVC;@property (nonatomic,assign)id 
            
              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
    
      *)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

第二层目录结构

一行代码打开相册/相机

代码地址如下：

http://www.demodashi.com/demo/11634.html

注：本文著作权归作者，由demo大师代发，拒绝转载，转载需要作者授权