iOS如何扫描HEIF格式的二维码图片
一、说在前面
iPhone7之后系统相机支持HEIF格式的图片，在扫描二维码时，该格式的图片需要转换成JPG格式才能进行扫描成功。
二、思路
用户在打开系统相册选择完一张照片后，要判断该照片是否是HEIF格式，如果是，进行格式转换之后再扫描JPG图片的内容，得到扫描结果。
三、具体实现
因为过程中用到photoKit，因此需要加入该头文件，#import
@protocolTVUImageManagerDelegate-(void)letQRCodeVCScanQRCodeImageInAlbum:(BOOL)isHEIFFormat; @end @interfaceTVUImageManager:NSObject @property(strong,nonatomic)UIImage*jpgImage; @property(strong,nonatomic)UIImage*selectedImage; @property(strong,nonatomic)PHAsset*selectedAsset; @property(nonatomic,strong)id delegate; +(TVUImageManager*)defaultManager; -(void)doSomethingAfterSelectedImage:(NSDictionary*)info; @end
自定义类：（.mm）
#defineIOS9orLater([UIDevicecurrentDevice].systemVersion.integerValue>=9)
@implementationTVUImageManager
#pragmamark-initpart
+(TVUImageManager*)defaultManager
{
staticTVUImageManager*m_manager=nil;
if(m_manager==nil){
m_manager=[[TVUImageManageralloc]init];
}
returnm_manager;
}
-(id)init
{
self=[superinit];
if(self){
}
returnself;
}
#pragmamark-imageformatpart
-(void)doSomethingAfterSelectedImage:(NSDictionary*)info
{
[selfgetSelectedImagePHAsset:info];
if(self.selectedAsset==nil){
log4cplus_error("TVUImageManagerLog","%s:selectedimageisnull",__func__);
return;
}else{
BOOLisHEIF=[selfjudgeIfAnImageIsHeifFormat];
if(isHEIF){
log4cplus_error("TVUImageManagerLog","%s:selectedimageisHEIFformat",__func__);
[selfconvertImageFormatFromHeifToJpegAndThenScanTheImage];
}else{
log4cplus_error("TVUImageManagerLog","%s:selectedimageisnotHEIFformat",__func__);
self.selectedImage=(UIImage*)[infoobjectForKey:UIImagePickerControllerOriginalImage];
if(self.selectedImage==nil){
log4cplus_error("TVUImageManagerLog","%s:selectedimageisnull",__func__);
return;
}
[self.delegateletQRCodeVCScanQRCodeImageInAlbum:NO];
}
}
}
//Chooseapicturefromthesystemalbum
-(void)getSelectedImagePHAsset:(NSDictionary*)info
{
log4cplus_error("TVUImageManagerLog","%s:getselectedimagePHAsset",__func__);
NSURL*imageAssetUrl=[infoobjectForKey:UIImagePickerControllerReferenceURL];
PHFetchResult*fetchResult=[PHAssetfetchAssetsWithALAssetURLs:[NSArrayarrayWithObject:imageAssetUrl]options:nil];
if(fetchResult.count==0){
log4cplus_error("TVUImageManagerLog","%s:fetchResult'scountis0",__func__);
return;
}
self.selectedAsset=(PHAsset*)fetchResult.firstObject;
}
//DetermineifthepictureisinHEIFformat
-(BOOL)judgeIfAnImageIsHeifFormat
{
log4cplus_error("TVUImageManagerLog","%s:begintojudgeifanimageisHEIFformat",__func__);
__blockBOOLisHEIF=NO;
if(IOS9orLater){
NSArray*resourceList=(NSArray*)[PHAssetResourceassetResourcesForAsset:self.selectedAsset];
[resourceListenumerateObjectsUsingBlock:^(id_Nonnullobj,NSUIntegeridx,BOOL*_Nonnullstop){
PHAssetResource*resource=obj;
NSString*UTI=resource.uniformTypeIdentifier;
if([UTIisEqualToString:@"public.heif"]||[UTIisEqualToString:@"public.heic"]){
isHEIF=YES;
*stop=YES;
}
}];
}else{
NSString*UTI=[self.selectedAssetvalueForKey:@"uniformTypeIdentifier"];
isHEIF=[UTIisEqualToString:@"public.heif"]||[UTIisEqualToString:@"public.heic"];
}
returnisHEIF;
}
//ConvertimageformatfromHEIFtoJPEGandthenscantheimage
-(void)convertImageFormatFromHeifToJpegAndThenScanTheImage
{
log4cplus_error("TVUImageManagerLog","%s:begintoconvertimageformatfromHEIFtoJPEG",__func__);
[[PHImageManagerdefaultManager]requestImageDataForAsset:self.selectedAssetoptions:nilresultHandler:^(NSData*_NullableimageData,NSString*_NullabledataUTI,UIImageOrientationorientation,NSDictionary*_Nullableinfo){
CIImage*ciImage=[CIImageimageWithData:imageData];
CIContext*context=[CIContextcontext];
NSData*jpgData=[contextJPEGRepresentationOfImage:ciImagecolorSpace:ciImage.colorSpaceoptions:@{}];
self.jpgImage=[UIImageimageWithData:jpgData];
[self.delegateletQRCodeVCScanQRCodeImageInAlbum:YES];
}];
}
@end
调用：
#pragmamarkUIImagePickerControllerDelegate
-(void)imagePickerController:(UIImagePickerController*)pickerdidFinishPickingMediaWithInfo:(NSDictionary*)info
{
[self.imageMgrdoSomethingAfterSelectedImage:info];
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持毛票票。
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