想來想去  終於想到一個解決辦法

urlString = [urlString stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];  //先去進行解碼

//    NSString *str = @"i'm a 蘋果。...";

for(int i=0; i< [urlString length];i++){

int a = [urlString characterAtIndex:i];

if( a > 0x4e00 && a < 0x9fff) {

NSLog(@"漢字");

            urlString = [urlString

stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];  //判斷是否含有中文  若還含有中文 則去進行編碼

break;

        }

    }

NSURLRequest *request = [[NSURLRequestalloc] initWithURL:[NSURLURLWithString:urlString]];

    [self.browseViewloadRequest:request];

    [self.addressBardisplayProgress:0.2];