objective-c 从网络下载图片，保存，并用 UIImageView 从保存中显示

概述objective-c 从网络下载图片，保存，并用 UIImageView 从保存中显示

下面是内存溢出 jb51.cc 通过网络收集整理的代码片段。

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//从网络下载图片-(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;}//将所下载的图片保存到本地-(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];    } else if ([[extension lowercaseString] isEqualToString:@"jpg"] || [[extension lowercaseString] isEqualToString:@"jpeg"]) {        [UIImageJPEGRepresentation(image,1.0) writetofile:[directoryPath stringByAppendingPathComponent:[Nsstring stringWithFormat:@"%@.%@",@"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");    }}//读取本地保存的图片-(UIImage *) loadImage:(Nsstring *)filename ofType:(Nsstring *)extension inDirectory:(Nsstring *)directoryPath {    UIImage * result = [UIImage imageWithContentsOffile:[Nsstring stringWithFormat:@"%@/%@.%@",directoryPath,filename,extension]];    return result;}//从网络下载图片，保存，并用 UIImageVIEw 从保存中显示Nsstring * documentsDirectoryPath = [NSSearchPathForDirectorIEsInDomains(NSdocumentDirectory,NSUserDomainMask,YES) objectAtIndex:0];    NSLog(@"保存路径:%@",documentsDirectoryPath);    //Get Image From URL    UIImage * 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 Directory    UIImage * 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);//该片段来自于http://outofmemory.cn

以上是内存溢出(jb51.cc)为你收集整理的全部代码内容，希望文章能够帮你解决所遇到的程序开发问题。

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总结

以上是内存溢出为你收集整理的objective-c 从网络下载图片，保存，并用 UIImageView 从保存中显示全部内容，希望文章能够帮你解决objective-c 从网络下载图片，保存，并用 UIImageView 从保存中显示所遇到的程序开发问题。

如果觉得内存溢出网站内容还不错，欢迎将内存溢出网站推荐给程序员好友。