如何在“ for”循環中添加子視圖

Question

我只是想為數組中的每個對象添加一個UIView，而在屏幕上不顯示3個以上，但視圖彼此不相鄰。 每個視圖之間有很大的差距（一個視圖寬度）。 這就是我所擁有的；

int numberOfUsersOnScreen;

if (array.count < 3) {
    numberOfViewsOnScreen = array.count;
}else{
    numberOfUsersOnScreen = 3;
}

double width = (self.scrollView.frame.size.width/numberOfViewsOnScreen);
CGRect r = CGRectMake(0, 0, width, 1200);
[self.usersScrollView setContentSize:CGSizeMake(width*array.count, 0)];

for (int i = 0; i < users.count; i++) {  
       r.origin.x = width * i;
       UIView * view = [[UIView alloc] initFrame:r];
       [self.scrollView addSubview:view];
}    

Answer 1

嘗試這個：

int xPosition = 0;
for (int i = 0; i < users.count; i++) {  
   UIView * view = [[UIView alloc] initFrame:CGRectMake(xPosition, 0, width, 1200)];
   [self.scrollView addSubview:view];
   xPosition += width;
}    

Answer 2

代替

[self.scrollView setContentSize:CGSizeMake(width*array.count, 0)];

它應該是

[self.scrollView setContentSize:CGSizeMake(width*array.count, self.scrollView.frame.size.height)];

Answer 3

for (int i = 0; i < users.count; i++) {  
   r.origin.x = width * i;
   UIView * view = [[UIView alloc] initFrame:r];
   [self.scrollView addSubview:view];
} 

這樣，您還可能在視圖對象上發生內存泄漏

for (int i = 0; i < users.count; i++) {  
   r.origin.x = width * i;
   UIView * view = [[UIView alloc] initFrame:r];
   [self.scrollView addSubview:view];
   [view release]; 
}