我試圖在用戶選擇照片時使用didFinishPickingMediaWithInfo。當他們紛紛拿起照片,我想生成一個數組來一個UILabel中的項目,就像這樣:從數組中選擇隨機項目iOS
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
NSArray *myArray = [NSArray arrayWithObjects:@"test1",@"test2",@"test3",@"test4",@"test5",@"test6", nil];
int numberOfObjects = self.yourArrayOfStrings.count;
NSInteger randomNumberInRange = arc4random() % numberOfObjects;
NSString *randomText = [myArray objectAtIndex:randomNumberInRange];
self->_label.text = randomText;
}
但我得到的錯誤:「物業‘yourArrayOfStrings’不是類型FDViewController的」對象中找到*'「就行了:」int numberOfObjects = self.yourArrayOfStrings.count;「。
我不知道我應該用什麼替換你的ArrayList。有任何想法嗎?
你在頭文件中聲明「yourArrayOfString」? @interface FDViewController:UIViewController { NSArray * yourArrayOfString; } – kailoon
您應該使用'arc4random_uniform(NUMBER)'而不是'arc4random()%NUMBER'(這會導致NUMBER'大多數值的分佈不均勻)! – Kitsune