我试着编写代码：
//This is an action connected to the button which will present the ActionController
- (IBAction)addFriend:(id)sender {
view = [UIAlertController alertControllerWithTitle:@"Add Friend" message:@"Write the friend to add"preferredStyle:UIAlertControllerStyleAlert];
[view addTextFieldWithConfigurationHandler:^(UITextField *textField) {
textField.placeholder = @"Friend";
textField.delegate = self;
textField.tag = 01;
}];
[self presentViewController:view animated:YES completion:nil];
}
- (BOOL)textFieldShouldReturn:(UITextField *)textField{
if(textField.tag == 01){
[array insertObject:textField.text atIndex:array.count];
[view dismissViewControllerAnimated:YES completion:^{
[self.pickerView reloadAllComponents];
}];
return YES;
}
return YES;
}
显示错误：
import numpy as np
import cv2
def duplicate(im):
img1 = im.copy()
k = im.shape
i=1
x=k[0]
y=k[1]
while(i<(x-2)):
j=1
while(j<(y-2)):
print i,j
a = (int(im[i,j+1])-int(im[i,j]))
b = (int(im[i+1,j])-int(im[i,j]))
c = (a**2) + (b**2)
c = np.sqrt(c)
if(c>=40):
img1[i,j] = img1[i-1,j] = img1[i,j-1] = img1[i-1,j-1] = 255
else:
img1[i,j] = 0
j+=1
i+=1
return img1
im = cv2.imread('book013.png')
imgray = cv2.cvtColor(im,cv2.COLOR_BGR2GRAY)
#ret,thresh = cv2.threshold(imgray,50,255,0)
img1 = duplicate(im)
image, contours, hierarchy = cv2.findContours(img1,cv2.RETR_TREE,cv2.CHAIN_APPROX_SIMPLE)
#print contours[42]
l=len(contours)
i=0
rect = cv2.minAreaRect(contours[l-1])
box = cv2.boxPoints(rect)
box = np.int0(box)
image1 = cv2.drawContours(im,[box],0,(0,0,255),2)
while(i<l):
print contours[i]
print cv2.contourArea(contours[i])
i+=1
#area = cv2.contourArea(contours)
#print area
#cv2.imwrite('bookd013.png',image)
cv2.imshow('image',image1)
#cv2.imshow('image'image)
cv2.waitKey(0)
cv2.destroyAllWindows()
有人可以建议对此代码进行哪些更改？