iOS 判断字符串是否为空字符串 && 判断字符串包含那个字符

- (BOOL) isBlankString:(NSString *)string {
if (string == nil || string == NULL) {
return YES;
}
if ([string isKindOfClass:[NSNull class]]) {
return YES;
}
if ([[string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]] length]==0) {
return YES;
}
return NO;
}

//判断roadTitleLab.text 是否含有qingjoin
if([roadTitleLab.text rangeOfString:@"qingjoin"].location !=NSNotFound)//_roaldSearchText
{
NSLog(@"yes");
}
else
{
NSLog(@"no");
}