objective-c - 随着时间间隔改变 NSImageView

Question

我正在尝试制作一个简单的双骰子游戏。在过去的一年里，我完成了大量的 C 编程，并且正在尝试转换为 GUI 和 Obj C。我的窗口内有一个按钮和两个图像单元。图像被视为输出(染料、染料2)，按钮保持 Action (滚轮)我的目标是让用户单击按钮，然后让图像单元显示一些图像，然后在迭代图像更改(比方说三次)后保留特定图像。这是我的 Dice 对象和我的应用程序委托(delegate)文件:

谢谢!

@implementation Dice

-(NSImage *) dicecreator {
int x;
x = rand() % 6 + 1;

    switch(x){
        case 1:
            _side = [NSImage imageNamed: @"firstside.jpg"];
            break;
        case 2:
            _side = [NSImage imageNamed: @"secondside.jpg"];
            break;
        case 3:
            _side = [NSImage imageNamed: @"thirdside.jpg"];
            break;
        case 4:
            _side = [NSImage imageNamed: @"fourthside.jpg"];
            break;
        case 5:
            _side = [NSImage imageNamed: @"fifthside.jpg"];
            break;
        case 6:
            _side = [NSImage imageNamed: @"sixthside.jpg"];
            break;
        default:
            return 0;
    }
return _side;
}
@end


@implementation AppDelegate

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
// Insert code here to initialize your application
}

- (IBAction)roller:(id)sender {

Dice *rollView = [[Dice alloc]init];

[self.dye setImage:rollView.dicecreator];

[self.dye2 setImage: rollView.dicecreator];

[self performSelector:@selector(dye) withObject:rollView.dicecreator afterDelay:0.5];

[self performSelector:@selector(dye2) withObject:rollView.dicecreator afterDelay:0.5];

[self performSelector:@selector(dye) withObject:rollView.dicecreator afterDelay:0.5];

[self performSelector:@selector(dye2) withObject:rollView.dicecreator afterDelay:0.5];

[self performSelector:@selector(dye) withObject:rollView.dicecreator afterDelay:0.5];

[self performSelector:@selector(dye2) withObject:rollView.dicecreator afterDelay:0.5];

}

@end 

Answer 1

你的问题是什么？

现在我可以看到，所有选择器都将在调用 Roller 方法后大约 0.5 秒被调用 - 您可能应该选择递增的值，例如 0.5、1、1.5...

此外，我建议使用 NSTimer 类:https://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSTimer_Class/Reference/NSTimer.html

编辑:再次阅读您的问题后，我认为您误解了选择器是什么 - 您应该像这样在其中添加一个方法:

-(void) assignImage1:(NSImage*)image {
    [self.dye setImage:image];
}


-(void) assignImage2:(NSImage*)image {
    [self.dye2 setImage:image];
}

...

[self performSelector:@selector(assignImage1:) withObject:[rollView dicecreator] afterDelay:0.5];

另请注意，在 Objective-C 中，您可以调用对象的函数，例如:

[rollView dicecreator]