iOS containsString与rangeOfString

NSString *str1 = @"can you \n speak English";
NSString *str = @"\n";
//在str1这个字符串中搜索\n，判断有没有
if ([str1 rangeOfString:str].location != NSNotFound) {
NSLog(@"这个字符串中有\n");
}

NSString *str1 = @"can you \n speak English";
NSString *str = @"\n";
//在str1这个字符串中搜索\n，判断有没有
if ([str1 containsString:str]) {
NSLog(@"这个字符串中有\n");
}