How do I convert an NSString value to NSData?
如何将NSString值转换为NSData ？
NSString* str = @"teststring";
NSData* data = [str dataUsingEncoding:NSUTF8StringEncoding];
NSString *str = @"helowrld";
// This converts the string to an NSData object
NSData *data = [str dataUsingEncoding:NSUTF8StringEncoding];
你可以参考这个链接
Converting NSString like so will force a trailing byte, which means NSJSONSerialization:JSONObjectWithData and others will fail unless you remove it.
Ie do
NSData* data = [yourString dataUsingEncoding:NSUTF8StringEncoding];
and then
data = [data subdataWithRange:NSMakeRange(0, [data length] - 1)];
then feel free to proceed with NSJSONSerialization:JSONObjectWithData .