如何检查NSString的最后一个字符

NSString *str = @"Hello, World!";
NSRange range = NSMakeRange([str length] - 1, 1);
NSString *lastChar = [str substringWithRange:range];

NSString *str = @"Hello, World!";
NSRange range = NSMakeRange([str length] - 1, 1);
NSString *lastChar = [str substringWithRange:range];

if ([lastChar isEqualToString:@","]) {
    NSLog(@"最后一个字符是逗号");
} else {
    NSLog(@"最后一个字符不是逗号");
}

NSString *str = @"Hello, World!";
NSRange range = NSMakeRange([str length] - 1, 1);
NSString *lastChar = [str substringWithRange:range];

NSCharacterSet *numbers = [NSCharacterSet decimalDigitCharacterSet];
if ([lastChar rangeOfCharacterFromSet:numbers].location != NSNotFound) {
    NSLog(@"最后一个字符是数字");
} else {
    NSLog(@"最后一个字符不是数字");
}

NSString *str = @"Hello, World!";
NSRange range = NSMakeRange([str length] - 1, 1);
NSString *lastChar = [str substringWithRange:range];

NSCharacterSet *letters = [NSCharacterSet letterCharacterSet];
if ([lastChar rangeOfCharacterFromSet:letters].location != NSNotFound) {
    NSLog(@"最后一个字符是字母");
} else {
    NSLog(@"最后一个字符不是字母");
}

NSString *str = @"Hello, World!";
NSRange range = NSMakeRange([str length] - 1, 1);
NSString *lastChar = [str substringWithRange:range];

if ([lastChar isEqualToString:@" "]) {
    NSLog(@"最后一个字符是空格");
} else {
    NSLog(@"最后一个字符不是空格");
}