-(UIImage *) getImageFromURL:(NSString *)fileURL { NSLog(@"执行图片下载函数"); UIImage * result; NSData * data = [NSData dataWithContentsOfURL:[NSURL URLWithString:fileURL]]; result = [UIImage imageWithData:data]; return result; }
-(void) saveImage:(UIImage *)image withFileName:(NSString *)imageName ofType:(NSString *)extension inDirectory:(NSString *)directoryPath { if([[extension lowercaseString] isEqualToString:@"png"]) { [UIImagePNGRepresentation(image) writeToFile:[directoryPath stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.%@", imageName,@"png"]] options:NSAtomicWrite error:nil]; }elseif([[extension lowercaseString] isEqualToString:@"jpg"] || [[extension lowercaseString] isEqualToString:@"jpeg"]) { [UIImageJPEGRepresentation(image,1.0) writeToFile:[directoryPath stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.%@", imageName,@"jpg"]] options:NSAtomicWrite error:nil]; }else{//ALog(@"Image Save Failed\nExtension: (%@) is not recognized, use (PNG/JPG)", extension);NSLog(@"文件后缀不认识"); }}
-(UIImage *) loadImage:(NSString *)fileName ofType:(NSString *)extension inDirectory:(NSString *)directoryPath { UIImage * result = [UIImage imageWithContentsOfFile:[NSString stringWithFormat:@"%@/%@.%@", directoryPath, fileName, extension]]; return result;}
NSString * documentsDirectoryPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]; NSLog(@"保存路径:%@",documentsDirectoryPath);//Get Image From URLUIImage * imageFromURL = [self getImageFromURL:@"http://file.duteba.com/phone/2009/04/5/ftGxL8kcUL.jpg"];//Save Image to Directory[self saveImage:imageFromURL withFileName:@"MyImage"ofType:@"jpg"inDirectory:documentsDirectoryPath];//Load Image From DirectoryUIImage * imageFromWeb = [self loadImage:@"MyImage"ofType:@"jpg"inDirectory:documentsDirectoryPath]; [img setImage:imageFromWeb];//取得目录下所有文件名NSArray *file = [[[NSFileManager alloc] init] subpathsAtPath:documentsDirectoryPath];//NSLog(@"%d",[file count]);NSLog(@"%@",file);//如何获取下载的文件的完整路径?
把已经下载的jpg用imageview显示
NSString *documentsDirectory2 = [path2 objectAtIndex:0];//path数组里貌似只有一个元素//字符串拼接得到文件完整路径NSString *filestr =@"/MyImage.jpg"; NSString *newstr = [documentsDirectory2 stringByAppendingString:filestr]; NSLog(@"完整路径是:%@",newstr); NSData *dd = [NSData dataWithContentsOfFile:newstr]; [img222 setImage:[UIImage imageWithData:dd]];
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