NSStringUIImage~NSData的相互转换以及中文转码

中文转码

    str = [str stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

   图片编码

    NSData *data;

NSData -->UIImage

    UIImage *image = [UIImage imageWithData:data];

UIImage-->NSData

    NSData *data1 = UIImagePNGRepresentation(image);

    NSData *data2 = UIImageJPEGRepresentation(image, 1.0);

NSData -->NSString

    str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

NSString --> NSData

    NSData *strData  = [str dataUsingEncoding:NSUTF8StringEncoding];