Question

所以我有一个绘制正方形的方法，它会随机抽取三角形，然后返回绘图方块。如何连续运行drawTriangle()一段时间，然后突破它？

drawShape(){  
   drawSquare();  
   if (arc4random_uniform(50) == 0){
      for 5 seconds{ << how do I implement that part?
         stopDrawSquare();
         drawTriangle();
      }
   }
}

SKAction *draw = [SKAction sequence:@[
                    [SKAction waitForDuration:1 withRange:1],
                    [SKAction performSelector:@selector(drawShape) onTarget:self]
                 ]];              
[self runAction:[SKAction repeatActionForever:draw] withKey:@"drawShape"];

Answer 1

创建2个ivars：

BOOL ready;
BOOL drawTriangle;

将ready设置为默认值true，将drawTriangle设置为默认值false。

将此代码添加到您的更新方法（或您决定应该去的任何地方）

if(ready == true) {
    if (arc4random_uniform(50) == 0) {
        drawTriangle = true;
        ready = false;
        SKAction *wait0 = [SKAction waitForDuration:5.0];
        SKAction *block0 = [SKAction runBlock:^{
            ready = true;
        }];
        [self runAction:[SKAction sequence:@[wait0, block0]]];
    } else {
        drawTriangle = false;
    }
}

if(drawTriangle == true) {
    NSLog(@"draw triangle");
} else {
    NSLog(@"draw square");
}

如何在Objective-C中运行一段代码？

1 个答案: