實驗：objective-C物件做為method的參數，應是copy，而不是直接傳指標

//程式碼如下

- (void)viewDidLoad

{

    [super viewDidLoad];

    int a = 2;

    NSArray* b = @[@2];

    NSLog(@"before:a=%d b=%@",a,b);

    [self testInt:a Object:b];

    NSLog(@"after:a=%d b=%@",a,b);

}

-(void) testInt:(int)a Object:(NSArray*) b{

    a = 1;

    b = @[@1];

    NSLog(@"processing:a=%d b=%@",a,b);

}

//Log如下

2014-02-13 13:26:54.160 testParse[11196:70b] before:a=2 b=(

    2

)

2014-02-13 13:26:54.161 testParse[11196:70b] processing:a=1 b=(

    1

)

2014-02-13 13:26:54.163 testParse[11196:70b] after:a=2 b=(

    2

)