相機相簿OC 詳解

這裡講的是

使用UIImagePickerController的實現相機相簿的呼叫。需實現

UIImagePickerControllerDelegate,UINavigationControllerDelegate兩個協議。

基本實現步驟：

1，初始化UIImagePickerController

2，判斷裝置是否支援攝像或允許開啟相簿

3，實現UIImagePickerController協議

4，進行回撥

程式碼：

//

// ViewController.m

// 相機相簿OC

//如果想要相簿功能按鈕漢化需在plist檔案中修改 Localization native development region value的值為 China

#define Log(log) NSLog(@"Test:%@",log)

#define LLog(c,log) {NSString * str = [[NSString alloc] initWithFormat:@"%@",c]; NSLog(@"%@:%@",str,log);}

#import "ViewController.h"

#import "UIImagePickerController+Judge.h"

#import "AlertViewController.h"

#import <MobileCoreServices/MobileCoreServices.h>

@interface ViewController ()<UIImagePickerControllerDelegate,UINavigationControllerDelegate>//UIImagePickerController需要實現的協議

///獲取圖片顯示

@property (weak, nonatomic) IBOutlet UIImageView *imageView;

///系統提供的用來獲取圖片和視訊的介面，執行UIImagePickerControllerDelegate,UINavigationControllerDelegate 兩個協議的回撥方法

@property (strong,nonatomic) UIImagePickerController * pickerImage;

//判斷是選取相簿照片，還是相機拍照

@property BOOL isAlum;

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

////初始化UIImagePickerController

self.pickerImage =[[UIImagePickerController alloc] init];

}

//開啟相機，需使用真機測試，否則會崩潰

- (IBAction)camera:(id)sender {

///代理判斷獲取資源型別

self.isAlum = NO;

//先設定sourceType

UIImagePickerControllerSourceType sourceType = UIImagePickerControllerSourceTypeCamera;

///設定資料來源型別，這裡設定為Camera

self.pickerImage.sourceType = sourceType;

//圖片允許編輯

self.pickerImage.allowsEditing = YES;

///如果裝置不支援攝像頭 isAvailableCamera 封裝好的相機檢測，網上有很多，下同

// 這裡返回的是 return [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera];

if (![_pickerImage isAvailableCamera])

{

//提醒框

[AlertViewController ViewController:self altetViewtitle:@"友情提示" Message:@"裝置未檢測到攝像頭" action:@"確定"];

}else if ([_pickerImage isAvailableCamera] && [_pickerImage isSupportTaklingPhotos])////isSupportTaklingPhotos 檢測是否可以拍照。

{//////如果有攝像頭，並且可以拍照

//設定代理

self.pickerImage.delegate = self;

///回撥

[self presentViewController:_pickerImage animated:YES completion:nil];

}else

{

///提醒框

[AlertViewController ViewController:self altetViewtitle:@"友情提示" Message:@"請在設定中開啟相機許可權" action:@"確定"];

}

//開啟相簿

- (IBAction)album:(id)sender {

self.isAlum = YES;

/*

*資料來源有三種：

* 1， UIImagePickerControllerSourceTypePhotoLibrary, ---來自相簿

* 2， UIImagePickerControllerSourceTypeCamera, ---來自相機

* 3， UIImagePickerControllerSourceTypeSavedPhotosAlbum ----來自相簿

*/

///設定資料來源型別，這裡設定為photo library

self.pickerImage.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

///協議

self.pickerImage.delegate = self;

//圖片允許編輯

self.pickerImage.allowsEditing = YES;

/*

*檢測相簿是否可用，即是否存在資料來源

*/

if ([_pickerImage isAvailablePhotoLibrary])

{

///回撥

[self presentViewController:_pickerImage animated:YES completion:nil];

}else

{

[AlertViewController ViewController:self altetViewtitle:@"友情提示" Message:@"相簿不可用" action:@"確定"];

}

#pragma mark-協議

///使用者選取完成後呼叫

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{

/* 使用者選取的資訊都在info裡

*info裡的鍵值如下：

* NSString *const UIImagePickerControllerMediaType ;指定使用者選擇的媒體型別（如下：）

* NSString *const UIImagePickerControllerOriginalImage ;原始圖片

* NSString *const UIImagePickerControllerEditedImage ;修改後的圖片

* NSString *const UIImagePickerControllerCropRect ;裁剪尺寸

* NSString *const UIImagePickerControllerMediaURL ;媒體的URL

* NSString *const UIImagePickerControllerReferenceURL ;原件的URL

* NSString *const UIImagePickerControllerMediaMetadata;當來資料來源是照相機的時候這個值才有效

*/

/*指定使用者選擇的媒體型別

*UIImagePickerControllerMediaType 包含著KUTTypeImage 和KUTTypeMovie

說明：使用指定媒體型別需包含 <MobileCoreServices/MobileCoreServices.h>庫

KUTTypeImage 包含：

const CFStringRef kUTTypeImage ;抽象的圖片型別

const CFStringRef kUTTypeJPEG ;

const CFStringRef kUTTypeJPEG2000 ;

const CFStringRef kUTTypeTIFF ;

const CFStringRef kUTTypePICT ;

const CFStringRef kUTTypeGIF ;

const CFStringRef kUTTypePNG ;

const CFStringRef kUTTypeQuickTimeImage ;

const CFStringRef kUTTypeAppleICNS

const CFStringRef kUTTypeBMP;

const CFStringRef kUTTypeICO;

KUTTypeMovie 包含：

const CFStringRef kUTTypeAudiovisualContent ;抽象的聲音視訊

const CFStringRef kUTTypeMovie ;抽象的媒體格式（聲音和視訊）

const CFStringRef kUTTypeVideo ;只有視訊沒有聲音

const CFStringRef kUTTypeAudio ;只有聲音沒有視訊

const CFStringRef kUTTypeQuickTimeMovie ;

const CFStringRef kUTTypeMPEG ;

const CFStringRef kUTTypeMPEG4 ;

const CFStringRef kUTTypeMP3 ;

const CFStringRef kUTTypeMPEG4Audio ;

const CFStringRef kUTTypeAppleProtectedMPEG4Audio;

*/

////獲取資料型別

NSString * mediaType = [info objectForKey:UIImagePickerControllerMediaType];

///如果是圖片型別

if ([mediaType isEqualToString:(NSString *)kUTTypeImage]) {

//如果是相簿選擇圖片，否則是拍照

if (_isAlum) {

//相簿選擇

[self chosePhoto:picker WithInfo:info];

}else{

///拍照

[self savePhoto:picker WithInfo:info];

}

}else{

}

//使用者取消選取時呼叫

-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{

[picker dismissViewControllerAnimated:YES completion:nil];

}

///拍照儲存

-(void)savePhoto:(UIImagePickerController*)picker WithInfo:(NSDictionary<NSString *,id> *)info{

////是否儲存成功

SEL select = @selector(imageWasSavedSuccessfully: didFinishSavingWithError: contextInfo:);

///選擇相片後移除相簿

[picker dismissViewControllerAnimated:YES completion:^{

UIImage * image;

//如果允許被編輯，獲取編輯後的圖片，否則獲取原始圖片

if (picker.allowsEditing) {

///編輯後的圖片

image = [info objectForKey:UIImagePickerControllerEditedImage];

}else{

//原始圖片

image = [info objectForKey:UIImagePickerControllerOriginalImage];

}

//顯示圖片

self.imageView.image = image;

/*

*非同步儲存圖片

*/

////分組

dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);

///非同步執行

dispatch_async(queue, ^{

dispatch_group_t group = dispatch_group_create();

///非同步

dispatch_group_async(group, queue, ^{

/////儲存到系統相簿中·

UIImageWriteToSavedPhotosAlbum(image, self, select, NULL);

});

}];

}

///選擇照片

-(void)chosePhoto:(UIImagePickerController*)picker WithInfo:(NSDictionary<NSString *,id> *)info{

///選擇相片後移除相簿

[picker dismissViewControllerAnimated:YES completion:^{

///顯示圖片

[self getImage:picker Info:info];

}];

}

/////顯示獲取選取後的圖片

-(void)getImage:(UIImagePickerController*)picker Info:(NSDictionary<NSString *,id> *)info{

UIImage * image;

//如果允許被編輯，獲取編輯後的圖片，否則獲取原始圖片

if (picker.allowsEditing) {

///編輯後的圖片

image = [info objectForKey:UIImagePickerControllerEditedImage];

}else{

//原始圖片

image = [info objectForKey:UIImagePickerControllerOriginalImage];

}

//顯示圖片

self.imageView.image = image;

}

// 儲存圖片到相簿後，呼叫的相關方法，檢視是否儲存成功

- (void)imageWasSavedSuccessfully:(UIImage *)paramImage didFinishSavingWithError:(NSError *)paramError contextInfo:(void *)paramContextInfo{

if (paramError == nil){

Log(@"Image was saved successfully.");

} else {

Log(@"An error happened while saving the image.");

LLog(@"Error = %@", paramError);

}

@end

效果圖：

Demo: 點我下載Demo

相機相簿OC 詳解

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