iphone - IOS 如何判断一个数是 NSInteger 还是 float ？

Question

我需要检查来自服务器的值是 NSString 、 NSInteger 还是 float。如果是字符串，我可以检查。但是我们如何区分 float 和整数？

Answer 1

这是怎么做的

NSNumber * n = //from somewhere
if (strcmp([n objCType], @encode(float)) == 0) {
    NSLog(@"this is a float");
} else if (strcmp([n objCType], @encode(int)) == 0) {
    NSLog(@"this is an int");
}

编辑

好的，让我们让它更通用

    NSNumber *anyNSObject = [NSNumber numberWithFloat:0.4];

    id obj = anyNSObject; //you can pass anything here as long as it is inherited from NSObject

    if ([obj isKindOfClass:[NSString class]]) {
        NSLog(@"This is string");
    }

    if ([obj isKindOfClass:[NSNumber class]]) {
        NSLog(@"This is NSNumber");

        if (strcmp([obj objCType], @encode(float)) == 0) {
            NSLog(@"this is a float");
        } else if (strcmp([obj objCType], @encode(int)) == 0) {
            NSLog(@"this is an int");
        }
    }