该问题纠结了我半天时间。。。查了很多资料，最后才发现调用writeToFile返回false的原因。在此附上解决方案：
NSData *imageData = UIImageJPEGRepresentation(currentImage, 1.0f);//currentImage是传过来的UIImage
NSString *inewImageName=[self getImagePath:imageName];//imageName为图片名称
BOOL operation = [imageData writeToFile:newImageName options:NSAtomicWrite error:&error];
方法：
- (NSString*)getImagePath:(NSString *)name {
NSArray *path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docPath = [path objectAtIndex:0];
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *finalPath = [docPath stringByAppendingPathComponent:name];
// Remove the filename and create the remaining path
[fileManager createDirectoryAtPath:[finalPath stringByDeletingLastPathComponent] withIntermediateDirectories:YES attributes:nil error:nil];//stringByDeletingLastPathComponent是关键
return finalPath;
}
希望能帮助大家解决问题哈~
