how does collide.rect work in pygame

问题

I'm having some trouble understanding how colliderect works with sprites. I have a good idea about it, but whenever I try to implement it into my game, I just get the error message "attributeError:'pygame.surface' object has no attribute 'rect'"

ufo_lvl_1 = pygame.image.load("ufo1.png") 
bullet = pygame.image.load("bullet.png")

class Bullet(pygame.sprite.Sprite):

    def __init__(self):
    # Call the parent class (Sprite) constructor
        pygame.sprite.Sprite.__init__(self) 

        self.image = bullet
        self.damage = 5
        self.rect = self.image.get_rect()

    def update(self):
        if 1 == 1:
            self.rect.x += 15
        if self.rect.x >1360:
            self.kill()

class ufo1(pygame.sprite.Sprite):

    def __init__(self):

        pygame.sprite.Sprite.__init__(self)

        self.image = ufo_lvl_1
        self.health = 10
        self.rect = self.image.get_rect()
    def update(self):
        if 1==1:
            self.rect.x  -= 10
            if self.rect.colliderect(bullet.rect):
                self.health -= bullet.damage
                if self.health >= 0:
                    self.kill()
                bullet.kill()            

Basically all my sprites work (excluding ufo1), but the moment I create a ufo1 sprite it crashes and I don't know how to fix it.

Thanks in advance.

回答1:

you called your class Bullet and your surface for that class bullet. When you are calling colliderect you are having it check bullet instead of Bullet or whatever you named the object of class Bullet

来源：https://stackoverflow.com/questions/15146679/how-does-collide-rect-work-in-pygame