iOS 一行代碼實現(xiàn)調(diào)用系統(tǒng)相機和相冊獲取圖片

一行代碼實現(xiàn)調(diào)用系統(tǒng)相機和相冊獲取圖片
5.gif
  • 使用擴展，對于簡單的調(diào)用系統(tǒng)原生相機和相冊封裝了一下。只需要一行代碼即可實現(xiàn)。
  • 可以自定義圖片尺寸，傳入imageSize即可，回調(diào)包括UIImage和ImageData

1.代碼.h

#import <UIKit/UIKit.h>

typedef void(^ImagePickerCompletionHandler)(NSData *imageData, UIImage *image);

@interface UIViewController (ImagePicker)

- (void)pickImageWithCompletionHandler:(ImagePickerCompletionHandler)completionHandler;
- (void)pickImageWithpickImageCutImageWithImageSize:(CGSize)imageSize CompletionHandler:(ImagePickerCompletionHandler)completionHandler;

@end

2.代碼.m

//
//  UIViewController+ImagePicker.m
//  
//
//  Created by tt on 8/3/18.
//  Copyright ? 2018 . All rights reserved.
//

#import "UIViewController+ImagePicker.h"

#import <objc/runtime.h>
#import <AssetsLibrary/AssetsLibrary.h>
#import <Photos/PHPhotoLibrary.h>
#import <AVFoundation/AVCaptureDevice.h>


static void *kImagePickerCompletionHandlerKey = @"kImagePickerCompletionHandlerKey";
static void *kCameraPickerKey = @"kCameraPickerKey";
static void *kPhotoLibraryPickerKey = @"kPhotoLibraryPickerKey";
static void *kImageSizeKey = @"kimageSizeKey";
static void *isCut =  @"isCut"; //截取

@interface UIViewController ()<UIActionSheetDelegate, UIImagePickerControllerDelegate, UINavigationControllerDelegate>

@property (nonatomic, strong) UIImagePickerController *cameraPicker;
@property (nonatomic, strong) UIImagePickerController *photoLibraryPicker;
@property (nonatomic, copy) ImagePickerCompletionHandler completionHandler;

@property (nonatomic, assign) BOOL isCutImageBool;
@property (nonatomic, assign) CGSize imageSize;

@end

@implementation UIViewController (ImagePicker)

- (void)pickImageWithCompletionHandler:(ImagePickerCompletionHandler)completionHandler {
    self.completionHandler = completionHandler;
    [self presentChoseActionSheet];
}


- (void)pickImageWithpickImageCutImageWithImageSize:(CGSize)imageSize CompletionHandler:(ImagePickerCompletionHandler)completionHandler
{
    self.completionHandler = completionHandler;
    self.isCutImageBool = YES;
    self.imageSize = imageSize;
    [self presentChoseActionSheet];
}

- (void)setUpCameraPickControllerIsEdit:(BOOL)isEdit {
    self.cameraPicker = [[UIImagePickerController alloc] init];
    self.cameraPicker.allowsEditing = isEdit; //拍照選去是否可以截取，和代理中的獲取截取后的方法配合使用
    self.cameraPicker.delegate = self;
    self.cameraPicker.sourceType = UIImagePickerControllerSourceTypeCamera;
}

- (void)setUpPhotoPickControllerIsEdit:(BOOL)isEdit {
    self.photoLibraryPicker = [[UIImagePickerController alloc] init];
    self.photoLibraryPicker.allowsEditing = isEdit; // 相冊選取是否截圖
    self.photoLibraryPicker.delegate = self;
    //去掉毛玻璃效果 否則在ios11 下 全局設置了UIScrollViewContentInsetAdjustmentNever 導致導航欄遮住了內(nèi)容視圖
    self.photoLibraryPicker.navigationBar.translucent = NO;
    self.photoLibraryPicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
}

- (void)presentChoseActionSheet {
    
    //先創(chuàng)建好 不然調(diào)用的時候 第一次創(chuàng)建很慢 有2秒的延遲
    if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
        //判斷相機可用
        [self setUpCameraPickControllerIsEdit:self.isCutImageBool];
    }
    [self setUpPhotoPickControllerIsEdit:self.isCutImageBool];
    
    UIAlertController * actionController = [UIAlertController alertControllerWithTitle:nil message:nil preferredStyle:UIAlertControllerStyleActionSheet];
    UIAlertAction * cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
        
    }];
    
    UIAlertAction * takePhotoAction = [UIAlertAction actionWithTitle:@"拍照" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        
        [AVCaptureDevice requestAccessForMediaType:AVMediaTypeVideo completionHandler:^(BOOL granted) {
    
            if (granted) {
                dispatch_async(dispatch_get_main_queue(), ^{
        [self presentViewController:self.cameraPicker animated:YES completion:nil];
    });
            }
            else {
                UIAlertController * noticeAlertController = [UIAlertController alertControllerWithTitle:@"未開啟相機權(quán)限，請到設置界面開啟" message:nil preferredStyle:UIAlertControllerStyleAlert];
                UIAlertAction * cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
                    
                }];
                
                UIAlertAction * okAction = [UIAlertAction actionWithTitle:@"現(xiàn)在就去" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
                    //跳轉(zhuǎn)到設置界面
                    [[UIApplication sharedApplication] openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString] options:@{} completionHandler:^(BOOL success) {
                        
                    }];
                }];
                
                [noticeAlertController addAction:cancelAction];
                [noticeAlertController addAction:okAction];
dispatch_async(dispatch_get_main_queue(), ^{
        [self presentViewController:noticeAlertController animated:YES completion:nil];
    });
                
            }
        }];

    }];
    
    UIAlertAction * choseFromAlbumAction = [UIAlertAction actionWithTitle:@"從相冊選取" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        //判斷相冊權(quán)限
        [PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {
            if (status == PHAuthorizationStatusNotDetermined || status == PHAuthorizationStatusAuthorized) {
                //未知的   第一次訪問
    dispatch_async(dispatch_get_main_queue(), ^{
        [self presentViewController:self.photoLibraryPicker animated:YES completion:nil];
    });
                

            }
            else {
                UIAlertController * noticeAlertController = [UIAlertController alertControllerWithTitle:@"未開啟相冊權(quán)限，請到設置界面開啟" message:nil preferredStyle:UIAlertControllerStyleAlert];
                UIAlertAction * cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
                    
                }];
                
                UIAlertAction * okAction = [UIAlertAction actionWithTitle:@"現(xiàn)在就去" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
                    //跳轉(zhuǎn)到設置界面
                    [[UIApplication sharedApplication] openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString] options:@{} completionHandler:^(BOOL success) {
                        
                    }];
                }];
                
                [noticeAlertController addAction:cancelAction];
                [noticeAlertController addAction:okAction];
    dispatch_async(dispatch_get_main_queue(), ^{
        [self presentViewController:noticeAlertController animated:YES completion:nil];
    });
                
            }
        }];

    }];
    
    [actionController addAction:cancelAction];
    [actionController addAction:takePhotoAction];
    [actionController addAction:choseFromAlbumAction];
    
    [self presentViewController:actionController animated:YES completion:^{
        
    }];
}

#pragma mark <UIImagePickerControllerDelegate>

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    [picker dismissViewControllerAnimated:YES completion:nil];
    UIImage *editedimage = [[UIImage alloc] init];
    if(self.isCutImageBool){
         //獲取裁剪的圖
        editedimage = info[@"UIImagePickerControllerEditedImage"]; //獲取裁剪的圖
        CGSize imageSize = CGSizeMake(413, 626);
        if (self.imageSize.height>0) {
            imageSize = self.imageSize;
        }
        editedimage = [self reSizeImage:editedimage toSize:imageSize];
    }
    else{
        editedimage = info[@"UIImagePickerControllerOriginalImage"];
    }
    NSData *imageData = UIImageJPEGRepresentation(editedimage, 0.0001);//首次進行壓縮
    UIImage *image = [UIImage imageWithData:imageData];
    //圖片限制大小不超過 1M     CGFloat  kb =   data.lenth / 1000;  計算kb方法 os 按照千進制計算
    while (imageData.length/1000 > 1024) {
        NSLog(@"圖片超過1M 壓縮");
        imageData = UIImageJPEGRepresentation(image, 0.5);
        image = [UIImage imageWithData:imageData];
    }
    self.completionHandler(imageData, image);
}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
    [picker dismissViewControllerAnimated:YES completion:nil];
}

- (UIImage *)reSizeImage:(UIImage *)image toSize:(CGSize)reSize
{
    UIGraphicsBeginImageContext(CGSizeMake(reSize.width, reSize.height));
    [image drawInRect:CGRectMake(0, 0, reSize.width, reSize.height)];
    UIImage *reSizeImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    return reSizeImage;
}

#pragma mark - setters & getters

- (void)setCompletionHandler:(ImagePickerCompletionHandler)completionHandler {
    objc_setAssociatedObject(self, kImagePickerCompletionHandlerKey, completionHandler, OBJC_ASSOCIATION_COPY);
}

- (ImagePickerCompletionHandler)completionHandler {
    return objc_getAssociatedObject(self, kImagePickerCompletionHandlerKey);
}

- (void)setCameraPicker:(UIImagePickerController *)cameraPicker {
    objc_setAssociatedObject(self, kCameraPickerKey, cameraPicker, OBJC_ASSOCIATION_RETAIN);
}

- (UIImagePickerController *)cameraPicker {
    return objc_getAssociatedObject(self, kCameraPickerKey);;
}

- (void)setPhotoLibraryPicker:(UIImagePickerController *)photoLibraryPicker {
    objc_setAssociatedObject(self, kPhotoLibraryPickerKey, photoLibraryPicker, OBJC_ASSOCIATION_RETAIN);
}

- (UIImagePickerController *)photoLibraryPicker {
    return objc_getAssociatedObject(self, kPhotoLibraryPickerKey);
}

- (void)setIsCutImageBool:(BOOL)isCutImageBool {
    return objc_setAssociatedObject(self, isCut, @(isCutImageBool), OBJC_ASSOCIATION_RETAIN);
}

- (BOOL)isCutImageBool {
    return [objc_getAssociatedObject(self, isCut) boolValue];
}

- (void)setImageSize:(CGSize)imageSize {
    return objc_setAssociatedObject(self, kImageSizeKey, [NSValue valueWithCGSize:imageSize], OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

- (CGSize)imageSize {
    NSValue * value = objc_getAssociatedObject(self, kImageSizeKey);
    return  value.CGSizeValue;
}

@end
  1. 然后就只需要一句代碼調(diào)用就行啦，在控制器里導入頭文件
#import "UIViewController+ImagePicker.h"

2 .一句代碼調(diào)用

不使用裁剪功能，獲取原圖
    [self pickImageWithCompletionHandler:^(NSData *imageData, UIImage *image) {
        //這里就拿到圖片了

    }];

使用裁剪功能-自定義圖片大小 我設置為400*400
    [self pickImageWithpickImageCutImageWithImageSize:CGSizeMake(400, 400) CompletionHandler:^(NSData *imageData, UIImage *image) {
       //這里就拿到圖片了
    }];
  • 包括了相冊和相機權(quán)限判斷，提示用戶開啟訪問權(quán)限并跳轉(zhuǎn)到設置界面開啟。
  • 需要iOS8以上，因為使用了UIAlertController。
  • 在info.plist文件添加相機和相冊訪問權(quán)限key 和value 文字描述隨便你寫什么都行，個人喜歡怎么寫就怎么寫。??
    1 .相機
    <key>Privacy - Camera Usage Description</key>
    <string>是否允許App訪問相機</string>
    2.相冊
    <key>Privacy - Photo Library Usage Description</key>
    <string>是否允許App訪問相冊</string>
  • ??ps：因為系統(tǒng)的界面按鈕文字是英文的，比如相機界面的 取消 按鈕，和相冊界面的 取消 按鈕，想要變成中文的話。
    在info.plist文件里找到
    <key>Localization native development region</key>
    值改為
    <string>China</string>
    然后那些按鈕的文字就變成中文了。
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