UIDevice属性和NSLog的问题

Question

我一直在尝试使用[UIDevice currentDevice ...]记录设备参数和NSLog。尽管尝试了不同的方法，但我总是得到相同的警告。

我得到的警告是：

Passing argument 1 of 'NSLog' from incompatible pointer type

以下是我的所有尝试：

1：

NSString *UDID = [[UIDevice currentDevice] uniqueIdentifier];
    NSString *deviceName = [[UIDevice currentDevice] name];
    NSString *deviceModel = [[UIDevice currentDevice] model];

    NSLog("\nDevice UDID: %@\nDevice Name: %@\nDevice Mode:%@\n",UDID, deviceName, deviceModel);

2：

NSString *UDID = (NSString*)[[UIDevice currentDevice] uniqueIdentifier];
    NSString *deviceName = (NSString*)[[UIDevice currentDevice] name];
    NSString *deviceModel = (NSString*)[[UIDevice currentDevice] model];

    NSLog("\nDevice UDID: %@\nDevice Name: %@\nDevice Mode:%@\n",UDID, deviceName, deviceModel);

3：

NSString *UDID = [NSString stringWithFormat:[[UIDevice currentDevice] uniqueIdentifier]];
    NSString *deviceName = [NSString stringWithFormat:[[UIDevice currentDevice] name]];
    NSString *deviceModel = [NSString stringWithFormat:[[UIDevice currentDevice] model]];

    NSLog("\nDevice UDID: %@\nDevice Name: %@\nDevice Mode:%@\n",UDID, deviceName, deviceModel);

4：

NSLog("\nDevice UDID: %@\nDevice Name: %@\nDevice Mode:%@\n",[[UIDevice currentDevice] uniqueIdentifier], [[UIDevice currentDevice] name], [[UIDevice currentDevice] model]);

有人能帮我吗？谢谢!

Answer 1

您需要使用NSString作为NSLog的第一个参数，例如

NSLog(@"\nDevice UDID: %@\nDevice Name: %@\nDevice Mode:%@\n",UDID, deviceName, deviceModel);

请注意字符串开头的'@‘

Answer 2

NSLog接受NSString作为格式字符串，而不是const char*。在字符串前面加上一个@。

即：

NSLog(@"\nDevice UDID: %@\nDevice Name: %@\nDevice Mode:%@\n", ....

Answer 3

NSLog需要NSString作为其格式参数。您应该像这样调用NSLog：

NSLog(@"\nDevice UDID: %@", [[UIDevice currentDevice] uniqueIdentifier]);

注意开头的"@“-这是一个常量的NSString引用。您使用的是纯C字符串。