iphone - 测试字符串所有字符的ascii值是否存在于给定范围内

Question

我需要检查字符串的所有字符的 ascii 值是否存在于给定范围内，比如（65 到 90），该方法应该根据测试返回 true 或 false，我如何在 Objective-c 中实现这一点？

Answer 1

Try this one:

Call the method as :

NSLog(@"Result: %d",[self isString:string fromASCII:65 toASCII:90]);

//Result: 1, says it is a valid string as per given range of ascii, and 0 for invalid.

The method is:

-(BOOL)isString:(NSString *)string fromASCII:(NSInteger)from toASCII:(NSInteger)to{
    BOOL isValid=YES;
    for (NSInteger i=0; i<string.length; i++) {
        if (!([string characterAtIndex:i]>=from && [string characterAtIndex:i]<=to) ){
            isValid=NO;
            break;
        }
    }    
    return isValid;
}