UITextFiled limit the number of decimal places

- (BOOL)validateNumber:(NSString*)number text:(NSString *)textFieldText floatCount:(NSInteger)floatCount {
    
    BOOL res = YES;
    
    NSCharacterSet* tmpSet = [NSCharacterSet characterSetWithCharactersInString:@"0123456789."];
    
    int i = 0;
    
    if (number.length==0) {
        
        //允许删除
        
        return  YES;
        
    }
    
    while (i < number.length) {
        
        //确保是数字
        
        NSString * string = [number substringWithRange:NSMakeRange(i, 1)];
        
        NSRange range = [string rangeOfCharacterFromSet:tmpSet];
        
        if (range.length == 0) {
            
            res = NO;
            
            break;
            
        }
        
        i++;
        
    }
    
    IF (textFieldText.length == 0) {
        
        // is not 0 and the first.
        
        IF ([Number as isEqualToString: @ "0"] || [Number as isEqualToString: @. ""]) {
            
            return NO;
            
        }
        
    }
    
    NSArray Array = * [textFieldText componentsSeparatedByString: "." @];
    
    NSInteger COUNT = [Array COUNT];
    
    // only one decimal
    
    IF: {(COUNT> 2 && [Number as isEqualToString @ "."])
        
        return NO;
        
    }
    
    // control words after the decimal point
    
    IF (. [: "." textFieldText rangeOfString @] = NSNotFound LOCATION!) {
        
        IF (textFieldText.length- [textFieldText rangeOfString: @. ""] LOCATION> floatCount.) {
            
            return NO;
            
        }
        
    }
    
    return res;
    
}