图像在 Tkinter 中消失

Question

我尝试在标签中输出图像。有两张图片，需要在标签中多次出现。而且它们只出现过一次——在后面的标签中。

class Application(tk.Frame):
    def __init__(self, master=None):
        #some actions

    def ShowImages(self, frame_in, type_img, place_img):
        print type_img
        print place_img
        print frame_in
        self.image = Image.open(type_img + ".png")
        self.image = self.image.resize((20, 20), Image.ANTIALIAS) #The (250, 250) is (height, width)
        self.photo = ImageTk.PhotoImage(self.image)
        label = tk.Label(frame_in, image=self.photo, relief='sunken', borderwidth=2)
        label.pack(side="right")

        self.image2 = Image.open(place_img + ".png")
        self.image2 = self.image2.resize((20, 20), Image.ANTIALIAS) #The (250, 250) is (height, width)
        self.photo2 = ImageTk.PhotoImage(self.image2)
        label = tk.Label(frame_in, image=self.photo2, relief='sunken', borderwidth=2)
        label.pack(side="right")

def createWidgets(self, dict_of_data):
        frame = tk.Frame(self, relief='sunken')
        frame.grid(row=0, column=self.index, sticky="WN")
        frame_in = tk.Frame(frame)
        frame_in.grid(row=0, sticky="WE", column=self.index)

        header = tk.Label(frame_in, anchor="nw", justify="left", text="Игра: ")
        header.pack(expand=True, fill="x", side="left")

        self.ShowImages(frame_in, dict_of_data["type"], dict_of_data["place_type"])
        #some other code

if __name__ == "__main__":
    app = Application()
    app.master.title('Sample application')
    #All that data is not real data of my script
    app.createWidgets({'name':"", 'state':"", "type":"", "date":{"start":"", 'end':""}, 'duration':{'days':'', 'hours':''}, 'site':'', 'rank':''})
    app.createWidgets({'name':"", 'state':"", "type":"", "date":{"start":"", 'end':""}, 'duration':{'days':'', 'hours':''}, 'site':'', 'rank':''})
    app.createWidgets({'name':"", 'state':"", "type":"", "date":{"start":"", 'end':""}, 'duration':{'days':'', 'hours':''}, 'site':'', 'rank':''})
    app.mainloop()

所以，用两个词来说：我尝试调用 ShowImages 函数 3 次，我想查看 6 张图像（3 x 2 图像），但我只看到最后 2 张。图像名称相同。

我认为这是打开图片的问题。也许有一些规则，我怎么可以多次使用一张图片。

P. S. 对不起我的英语。我不知道，我需要如何描述我的麻烦。谢谢

Answer 1

我的问题解决了！感谢@FabienAndre 和 THIS post。我刚刚意识到，每次调用函数时，self.photo 和 self.photo2 变量的旧值都会被清除，图像也会消失。

为了解决这个问题，我在 Class 构造函数中准备了我需要的所有图像，并且每次都在变量中使用相同的值。

class Application(tk.Frame):
    def __init__(self, master=None):
        tk.Frame.__init__(self, master)
        self.initImages()                                #Prepare images
        self.master.resizable(width=False, height=False)
        self.index = 0
        self.grid()

    def initImages(self):
        self.images = {}
        buf = Image.open("Classic.png")
        buf = buf.resize((20, 20), Image.ANTIALIAS) #The (250, 250) is (height, width)
        self.images['Classic'] = ImageTk.PhotoImage(buf)

        buf = Image.open("Jeopardy.png")
        buf = buf.resize((20, 20), Image.ANTIALIAS) #The (250, 250) is (height, width)
        self.images['Jeopardy'] = ImageTk.PhotoImage(buf)

        buf = Image.open("On-site.png")
        buf = buf.resize((20, 20), Image.ANTIALIAS) #The (250, 250) is (height, width)
        self.images['On-site'] = ImageTk.PhotoImage(buf)

        buf = Image.open("On-line.png")
        buf = buf.resize((20, 20), Image.ANTIALIAS) #The (250, 250) is (height, width)
        self.images['On-line'] = ImageTk.PhotoImage(buf)

    def ShowImages(self, frame_in, type_img, place_img):
        label = tk.Label(frame_in, image=self.images[type_img])
        label.pack(side="right")

        label = tk.Label(frame_in, image=self.images[place_img])
        label.pack(side="right")

    def createWidgets(self, dict_of_data):
        frame = tk.Frame(self, relief='sunken')
        frame.grid(row=0, column=self.index, sticky="WN")
        frame_in = tk.Frame(frame)
        frame_in.grid(row=0, sticky="WE", column=self.index)
        #some other code here

P.S。我知道，我的英语很可笑，但我没有练习...抱歉

图像在 Tkinter 中消失

Images disappearing in Tkinter

image

tkinter

python-imaging-library

python-2.7