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POCGRect positioning according to center point
 

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    <p>I'm trying to create multiple views for an iPad app. First I created a menu view and then a sub-menu view with coordinates according to menu. So it looks like this:</p> <p><img src="https://i.stack.imgur.com/Lvb7e.png" alt="enter image description here"></p> <p>What I did:</p> <pre><code>self.view = [[UIView alloc] initWithFrame:CGRectMake(self.parentViewController.view.frame.size.width, 0, 150, screenHeight)]; </code></pre> <p>But now on sub-menu I'm trying to create the content view, which is a UINavigationController. Trying to do the same thing, I get this result:</p> <p><img src="https://i.stack.imgur.com/fNVjk.png" alt="enter image description here"></p> <p>What I'm doing (this time creating the frame on sub-menu view controller):</p> <pre><code>CGRect frame = CGRectMake(self.view.frame.origin.x + self.view.frame.size.width, 0, [[UIScreen mainScreen] bounds].size.width - self.view.frame.origin.x - self.view.frame.size.width, [[UIScreen mainScreen] bounds].size.height); </code></pre> <p>It's pretty self-explanatory but, I just get the sub-menu origin and add its width so I can get the right edge coordinate.</p> <p>After a lot of attempts I managed to get it working, because I noticed that the CGRectMake is using the center of the UINavigationController view to arrange its position. So the following code:</p> <pre><code>CGRect frame = CGRectMake(self.view.frame.origin.x + self.view.frame.size.width + 259, 0, [[UIScreen mainScreen] bounds].size.width - self.view.frame.origin.x - self.view.frame.size.width, [[UIScreen mainScreen] bounds].size.height); </code></pre> <p>Yields the right position.</p> <p>What's going on? I thought CGRectMake origin would always be top-left, but on this particularly view is actually top-middle (or middle-middle, not sure.) What am I doing wrong?</p> <p><strong>EDIT1:</strong></p> <p>Here's the console output for the frame with right position:</p> <p><img src="https://i.stack.imgur.com/JIQQR.png" alt="enter image description here"></p> <p>Notice how the nav bar is now positioned right:</p> <p><img src="https://i.stack.imgur.com/C8mWZ.png" alt="enter image description here"></p> <p>But the x-coord is not 250 (as it should be, because menu.width + sub-menu.width = 250.)</p> <p><strong>EDIT2:</strong></p> <p>I eventually gave up. The problem was with the automatically generated UINavigationBar, which is created by the UINavigationViewController. I can't seem to figure out how to configure it. I'm gonna leave the question open in case someone knows the answer.</p>
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    1. COwell it depends in what view you are using. The origin technically is always the top left in a UI element object. If you have lets say another UIView object as your subview, then you are going to have to accommodate the subview positing. It will seem to start in the middle of the self.view, but that is because it will be starting at (0,0) like in the regular self.view Hope this helps
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    2. COThis may help you : http://stackoverflow.com/questions/6784823/draw-an-image-in-the-center-of-another-rectangle-using-canvas
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    3. COhttp://stackoverflow.com/questions/11251988/how-to-center-a-subview-of-uiview
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