去掉NSString空字符串

一、

NSString *str = @"sdjflkjdf sdf yiuo ";

    str = [str stringByReplacingOccurrencesOfString:@" " withString:@""];

二、

-(NSString*)trimString:(NSString*)str
{
    NSMutableString *mstr = [str mutableCopy];
    CFStringTrimWhitespace((CFMutableStringRef)mstr);
    NSString *result = [mstr copy];
    [mstr release];
    return [result autorelease];
    
}