iOS 獲取圖片有三種方法：
1. 直接調用攝像頭拍照
2. 從相冊中選擇
3. 從圖庫中選擇
UIImagePickerController 是系統提供的用來獲取圖片和視頻的接口；
用UIImagePickerController 類來獲取圖片視頻，大體分為以下幾個步驟：
1. 初始化UIImagePickerController 類；
2. 設置UIImagePickerController 實例的數據來源類型（下面解釋）；
3. 設置設置代理；
4. 如果需要做圖片修改的話設置allowsEditing =yes。
數據來源類型一共有三種：
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enum {
UIImagePickerControllerSourceTypePhotoLibrary ,
//來自圖庫
UIImagePickerControllerSourceTypeCamera ,
//來自相機
UIImagePickerControllerSourceTypeSavedPhotosAlbum
//來自相冊
};
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在用這些來源的時候最好檢測以下設備是否支持；
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if
([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
{
NSLog(@
"支持相機"
);
}
if
([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary])
{
NSLog(@
"支持圖庫"
);
}
if
([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeSavedPhotosAlbum])
{
NSLog(@
"支持相片庫"
);
}
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調用攝像頭來獲取資源
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- (void)viewDidLoad {
[
super
viewDidLoad];
picker = [[UIImagePickerController alloc]init];
picker.view.backgroundColor = [UIColor orangeColor];
UIImagePickerControllerSourceType sourcheType = UIImagePickerControllerSourceTypeCamera;
picker.sourceType = sourcheType;
picker.delegate = self;
picker.allowsEditing = YES;
}
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上面只是實例了UIImagePickerController及其屬性 在需要獲取圖片的時候需要彈出窗口調用
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[self presentViewController:picker animated:YES completion:nil];
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我們還需要代理來獲取我們選中的圖片
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UIImagePickerControllerDelegate
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代理中一共三個方法 其中一個3.0 已經廢棄了，只剩下兩個我們需要用的
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- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary
*)info;
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當用戶選取完成后調用；
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- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker;
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當用戶取消選取時調用；
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- (void)imagePickerController:(UIImagePickerController *)picker
didFinishPickingMediaWithInfo:(NSDictionary *)info;
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選取的信息都在info中，info 是一個字典。
字典中的鍵：
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NSString *const UIImagePickerControllerMediaType ;指定用戶選擇的媒體類型（文章最后進行擴展）
NSString *const UIImagePickerControllerOriginalImage ;原始圖片
NSString *const UIImagePickerControllerEditedImage ;修改后的圖片
NSString *const UIImagePickerControllerCropRect ;裁剪尺寸
NSString *const UIImagePickerControllerMediaURL ;媒體的URL
NSString *const UIImagePickerControllerReferenceURL ;原件的URL
NSString *const UIImagePickerControllerMediaMetadata;當來數據來源是照相機的時候這個值才有效
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UIImagePickerController 的更多參數參考這里。
代理中的功能參考這里。
UIImagePickerControllerMediaType 包含着KUTTypeImage 和KUTTypeMovie
KUTTypeImage 包含：
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const CFStringRef kUTTypeImage ;抽象的圖片類型
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;
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KUTTypeMovie 包含：
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const CFStringRef kUTTypeAudiovisualContent ;抽象的聲音視頻
const CFStringRef kUTTypeMovie ;抽象的媒體格式（聲音和視頻）
const CFStringRef kUTTypeVideo ;只有視頻沒有聲音
const CFStringRef kUTTypeAudio ;只有聲音沒有視頻
const CFStringRef kUTTypeQuickTimeMovie ;
const CFStringRef kUTTypeMPEG ;
const CFStringRef kUTTypeMPEG4 ;
const CFStringRef kUTTypeMP3 ;
const CFStringRef kUTTypeMPEG4Audio ;
const CFStringRef kUTTypeAppleProtectedMPEG4Audio;
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轉載自：http://blog.csdn.net/kingsley_cxz/article/details/9157093
1.UIImagePickerController的靜態方法:
imagepicker = [[UIImagePickerController alloc]init];
//UIImagePickerController靜態方法判斷設備是否支持照相機／圖片庫／相冊功能
/*
typedef NS_ENUM(NSInteger, UIImagePickerControllerSourceType) {
UIImagePickerControllerSourceTypePhotoLibrary,
UIImagePickerControllerSourceTypeCamera,
UIImagePickerControllerSourceTypeSavedPhotosAlbum
};
*/
BOOL isCameraSupport = [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera];
NSLog(@"support camera:%d",isCameraSupport);
//UIImagePickerController靜態方法判斷設備是否支持前置攝像頭／后置攝像頭
/*
typedef NS_ENUM(NSInteger, UIImagePickerControllerCameraDevice) {
UIImagePickerControllerCameraDeviceRear,
UIImagePickerControllerCameraDeviceFront
};
*/
BOOL isRearSupport = [UIImagePickerController isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceRear];
NSLog(@"rear support:%d",isRearSupport);
//UIImagePickerController靜態方法判斷設備是否支持前置攝像頭閃光燈／后置攝像頭閃光燈
/*
typedef NS_ENUM(NSInteger, UIImagePickerControllerCameraDevice) {
UIImagePickerControllerCameraDeviceRear,
UIImagePickerControllerCameraDeviceFront
};
*/
BOOL isFlushSupport = [UIImagePickerController isFlashAvailableForCameraDevice:UIImagePickerControllerCameraDeviceRear];
NSLog(@"rear flash support:%d",isFlushSupport);
//UIImagePickerController靜態方法返回前置攝像頭／后置攝像頭支持的拍攝類型
/*
typedef NS_ENUM(NSInteger, UIImagePickerControllerCameraDevice) {
UIImagePickerControllerCameraDeviceRear,
UIImagePickerControllerCameraDeviceFront
};
*/
//返回類型有照片和視頻
/*
enum {
UIImagePickerControllerCameraCaptureModePhoto,
UIImagePickerControllerCameraCaptureModeVideo
};
typedef NSUInteger UIImagePickerControllerCameraCaptureMode;
*/
NSArray* captureModes = [UIImagePickerController availableCaptureModesForCameraDevice:UIImagePickerControllerCameraDeviceRear];
for (NSNumber* mode in captureModes) {
NSLog(@"capture modes:%d",[mode integerValue]);
}
//UIImagePickerController靜態方法返回照相機／相冊／照片庫所支持的媒體類型
/*
typedef NS_ENUM(NSInteger, UIImagePickerControllerSourceType) {
UIImagePickerControllerSourceTypePhotoLibrary,
UIImagePickerControllerSourceTypeCamera,
UIImagePickerControllerSourceTypeSavedPhotosAlbum
};
*/
//返回類型有kUTTypeMovie,kUTTypeImage，其他類型均在<MobileCoreServices/MobileCoreServices.h>下
NSArray* mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypeCamera];
for (NSString* type in mediaTypes) {
NSLog(@"media types:%@",type);
}
2.UIImagePickerController屬性詳解：
//指定使用照相機模式,可以指定使用相冊／照片庫
imagepicker.sourceType = UIImagePickerControllerSourceTypeCamera;
//設置當拍照完或在相冊選完照片后，是否跳到編輯模式進行圖片剪裁。只有當showsCameraControls屬性為true時才有效果
imagepicker.allowsEditing = YES;
//設置拍照時的下方的工具欄是否顯示，如果需要自定義拍攝界面，則可把該工具欄隱藏
imagepicker.showsCameraControls = YES;
//設置使用后置攝像頭，可以使用前置攝像頭
imagepicker.cameraDevice = UIImagePickerControllerCameraDeviceRear;
//設置閃光燈模式
/*
typedef NS_ENUM(NSInteger, UIImagePickerControllerCameraFlashMode) {
UIImagePickerControllerCameraFlashModeOff = -1,
UIImagePickerControllerCameraFlashModeAuto = 0,
UIImagePickerControllerCameraFlashModeOn = 1
};
*/
imagepicker.cameraFlashMode = UIImagePickerControllerCameraFlashModeAuto;
//設置相機支持的類型，拍照和錄像
imagepicker.mediaTypes = @[(NSString*)kUTTypeImage,(NSString*)kUTTypeMovie];
//設置拍攝時屏幕的view的transform屬性，可以實現旋轉，縮放功能
// imagepicker.cameraViewTransform = CGAffineTransformMakeRotation(M_PI*45/180);
// imagepicker.cameraViewTransform = CGAffineTransformMakeScale(1.5, 1.5);
//所有含有cameraXXX的屬性都必須要sourceType是UIImagePickerControllerSourceTypeCamera時設置才有效果，否則會有異常
//設置UIImagePickerController的代理
imagepicker.delegate = self;
-(void)showCamera{
//用模態方式呈現imagepicker
[self presentModalViewController:imagepicker animated:YES];
}
使用 imagepicker.cameraViewTransform = CGAffineTransformMakeRotation(M_PI*45/180);旋轉45度的效果：
使用imagepicker.cameraViewTransform = CGAffineTransformMakeScale(1.5, 1.5);全屏的效果，同時imagepicker.showsCameraControls =NO;隱藏工具欄：
使用imagepicker.allowsEditing = YES;出現的圖片編輯效果，只有當imagepicker.showsCameraControls = YES;才有效果：
使用 imagepicker.mediaTypes = @[(NSString*)kUTTypeImage,(NSString*)kUTTypeMovie];支持拍照和視頻的前后對比效果：
3.UIImagePickerController回調詳解：
//成功獲得相片還是視頻后的回調
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
//通過UIImagePickerControllerMediaType判斷返回的是照片還是視頻
NSString* type = [info objectForKey:UIImagePickerControllerMediaType];
//如果返回的type等於kUTTypeImage，代表返回的是照片,並且需要判斷當前相機使用的sourcetype是拍照還是相冊
if ([type isEqualToString:(NSString*)kUTTypeImage]&&picker.sourceType==UIImagePickerControllerSourceTypeCamera) {
//獲取照片的原圖
UIImage* original = [info objectForKey:UIImagePickerControllerOriginalImage];
//獲取圖片裁剪的圖
UIImage* edit = [info objectForKey:UIImagePickerControllerEditedImage];
//獲取圖片裁剪后，剩下的圖
UIImage* crop = [info objectForKey:UIImagePickerControllerCropRect];
//獲取圖片的url
NSURL* url = [info objectForKey:UIImagePickerControllerMediaURL];
//獲取圖片的metadata數據信息
NSDictionary* metadata = [info objectForKey:UIImagePickerControllerMediaMetadata];
//如果是拍照的照片，則需要手動保存到本地，系統不會自動保存拍照成功后的照片
UIImageWriteToSavedPhotosAlbum(edit, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
}else{
}
//模態方式退出uiimagepickercontroller
[imagepicker dismissModalViewControllerAnimated:YES];
}
//取消照相機的回調
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{
//模態方式退出uiimagepickercontroller
[imagepicker dismissModalViewControllerAnimated:YES];
}
//保存照片成功后的回調
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error
contextInfo:(void *)contextInfo{
NSLog(@"saved..");
}
4.自定義相機拍照畫面：
//設置拍照時的下方的工具欄是否顯示，如果需要自定義拍攝界面，則可把該工具欄隱藏
imagepicker.showsCameraControls = NO;
UIToolbar* tool = [[UIToolbar alloc]initWithFrame:CGRectMake(0, self.view.frame.size.height-55, self.view.frame.size.width, 75)];
tool.barStyle = UIBarStyleBlackTranslucent;
UIBarButtonItem* cancel = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:@selector(cancelCamera)];
UIBarButtonItem* add = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemSave target:self action:@selector(savePhoto)];
[tool setItems:[NSArray arrayWithObjects:cancel,add, nil]];
//把自定義的view設置到imagepickercontroller的overlay屬性中
imagepicker.cameraOverlayView = tool;
-(void)cancelCamera{
[imagepicker dismissModalViewControllerAnimated:YES];
}
-(void)savePhoto{
//拍照，會自動回調- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info，對於自定義照相機界面，拍照后回調可以不退出實現連續拍照效果
[imagepicker takePicture];
}
5.UIImagePickerController是繼承UINavigationController,所以可以push和pop一些viewcontroller進行導航效果。例如，自定義照相機畫面的時候可以在拍攝完后push一個viewcontroller用於對照片進行編輯