/NSData转换为UIImage
NSData *imageData = [NSData dataWithContentsOfFile:imagePath];
UIImage *image = [UIImage imageWithData:imageData];
//UIImage转换为NSData
//第二个参数为压缩倍数
NSData *imageData = UIImageJPEGRepresentation(image,1.0f);
/NSData转换为UIImage
NSData *imageData = [NSData dataWithContentsOfFile:imagePath];
UIImage *image = [UIImage imageWithData:imageData];
//UIImage转换为NSData
//第二个参数为压缩倍数
NSData *imageData = UIImageJPEGRepresentation(image,1.0f);