Swift

let str : NSString = CFURLCreateStringByAddingPercentEscapes(nil, dic, "!*'();:@&=+$,/?%#[]" as CFString, nil, CFStringBuiltInEncodings.UTF8.rawValue)
// let str : NSString = dic.addingPercentEncoding(withAllowedCharacters: NSCharacterSet.urlQueryAllowed)! as NSString
// let str : NSString = dic.addingPercentEscapes(using: String.Encoding.utf8.rawValue)!
// let str : NSString = dic.addingPercentEncoding(withAllowedCharacters: NSCharacterSet(charactersIn:"`#%^{}\"[]|\\<> ").inverted)!

OC

//編碼
- (NSString *)encode { 
 CFStringRef strRef = CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)self, NULL, NULL, kCFStringEncodingUTF8); 
return (NSString *)CFBridgingRelease(strRef);
}

經(jīng)過上面的編碼即可加載出圖片