IOS urlwithstring return to null nil solution

[Nsurl urlwithstring:@ "......"]
But seemingly Chinese characters or spaces can not be recognized, string is not considered to be urlstring, this nsurl value has been nil
How can it be recognized?
Here's how to fix it:
1. Conversion Codes

str1 = [str1 stringbyaddingpercentescapesusingencoding:nsutf8stringencoding];

nsurl *url = [nsurl urlwithstring: [Tool returnformatstring: str1]];
    
2. Remove Spaces

+ (nsstring *) returnformatstring: (nsstring *) str
{
return [str stringbyreplacingoccurrencesofstring: @ "] Withstring:@ ""];
}

NSLog ( @ "url==%@", URL);

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IOS urlwithstring return to null nil solution