以下代码来源于网络

//判断字符串中是否含有某个字符串

+ (BOOL)isHaveSpaceInString:(NSString *)string{

NSRange _range = [string rangeOfString:@" "];

if (_range.location != NSNotFound) {

return YES;

}else {

return NO;

}

}

//判断字符串中是否含有中文

+ (BOOL)isHaveChineseInString:(NSString *)string{

for(NSInteger i = 0; i < [string length]; i++){

int a = [string characterAtIndex:i];

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

return YES;

}

}

return NO;

}

//判断字符串是否全部为数字

+ (BOOL)isAllNum:(NSString *)string{

unichar c;

for (int i=0; i

c=[string characterAtIndex:i];

if (!isdigit(c)) {

return NO;

}

}

return YES;

}