Question

我想在按钮＆＃34;取消＆＃34;时转到视图控制器。被压了。我尝试使用此方法但是当我点击“取消”＃34;时，它只显示黑屏。我是IOS的初学者。

from Tkinter import *

class Application(Frame):
""" A SPC program that takes user input and saves the file """
def __init__(self,master):
    """ initializes the frame """
    Frame.__init__(self,master)
    self.grid()
    #creates an array to store entries into
    self.entry_list = [None]*7
    self.create_widgets()


def create_widgets(self):
    """create widgets for user inputted data"""
    # creates a text widget next to the entries that displays what the user has input
    Label(self, text = "Do these values you entered seem correct?").grid(row = 0, column = 4, sticky = W, padx = 5, pady = 5)
    self.checktext = Text(self, width =15, height = 42, wrap = WORD)
    self.checktext.grid(row = 1, rowspan = 10, column = 4, sticky = W, padx =5, pady =5)

    # get name
    Label(self, text = "First Name:").grid(row = 0, column = 0, sticky = W, padx=5, pady=5)
    self.entry_list[0] = Entry(self)
    self.entry_list[0].grid(row = 0, column = 1)       
    Label(self, text = "Last Name:").grid(row = 1, column = 0, sticky = W, padx=5, pady=5)
    self.entry_list[1] = Entry(self)
    self.entry_list[1].grid(row = 1, column = 1)

    # get work order
    Label(self, text = "Work Order Number:").grid(row = 2, column = 0, sticky = W, padx=5, pady=5)
    self.entry_list[2] = Entry(self)
    self.entry_list[2].grid(row = 2, column = 1)

    # get todays date
    Label(self, text = "Todays Date:").grid(row = 3, column = 0, sticky = W, padx=5, pady=5)
    self.entry_list[3] = Entry(self)
    self.entry_list[3].grid(row = 3, column = 1)

    # get bubble number
    Label(self, text = "Bubble Number:").grid(row = 4, column = 0, sticky = W, padx=5, pady=5)
    self.entry_list[4] = Entry(self)
    self.entry_list[4].grid(row = 4, column = 1)

    # get USL and LSL
    Label(self, text = "USL:").grid(row = 5, column = 0, sticky = W, padx=5, pady=5)        
    self.entry_list[5] = Entry(self)
    self.entry_list[5].grid(row = 5, column = 1)    
    Label(self, text = "LSL:").grid(row = 6, column = 0, sticky = W, padx=5, pady=5)       
    self.entry_list[6] = Entry(self)
    self.entry_list[6].grid(row = 6, column = 1)                      

    # button to submit user entered values up to the input data values portion of the gui
    self.button = Button(self)
    self.button["text"] = "Submit"
    self.button["command"] = self.submit
    self.button.grid(row = 5, column = 2, sticky = W, padx=5, pady=5)

    # creates a spot to dictate whether USL and LSL are correct
    self.checklimits = Text(self, width = 20, height = 3, wrap = WORD)
    self.checklimits.grid(row = 6, column = 3, sticky = W, padx = 5)

    """# get User Input Data values
    Label(self, text = "Enter Results:").grid(row = 7, column = 0, sticky = W, padx=5, pady=5)        
    self.entry_list8 = Text(self, width = 15, height = 30)
    self.entry_list8.grid(row = 7, column = 1) """  

def submit(self):
    """ submits user data up to input data section of GUI and checks USL vs LSL"""
    # checks to make sure limits were imput properly
    USL = int(self.entry_list[5].get())
    LSL = int(self.entry_list[6].get())

    if USL > LSL:
        message = "Limits are good"
    else:
        message = "USL can't be less than LSL, please re-enter USL and LSL"

    self.checklimits.delete(0.0, END)
    self.checklimits.insert(0.0, message)


    # puts entries into text box
    for x in self.entry_list:
       entry = x.get()
       if entry:
            self.checktext.delete(0.0, END)
            self.checktext.insert(END, entry + "\n")




root = Tk()
root.title("SPC Input Program")
root.geometry("700x750")

app = Application(root)

赞成评论：

 -(void) cancelButtonPressed {

    homeView = (HomeViewController *)[[UIViewController alloc]init];
    [self presentViewController:homeView animated:YES completion:nil];
}

Answer 1

尝试这样做：

     HomeViewController *homeView = [[HomeViewController alloc]init];
     [self presentViewController:homeView animated:YES completion:nil];

另请注意，黑色是窗口的默认颜色。如果您没有任何名为HomeViewController的视图控制器，并且您呈现它，默认情况下它将显示为用户的黑色。

要避免这种情况，您需要为新呈现的视图控制器设置视图，您可以通过homeView.view

访问该视图控制器

如果您使用的是故事板，请使用故事板ID：

     HomeViewController *homeView = [self.storyboard instantiateViewControllerWithIdentifier:@"HomeViewController"];
      [self presentViewController:homeView animated:YES completion:nil];

呈现视图控制器

1 个答案: