zebra barcode printer in vb.net Figure 3 9. Overview of autosizing controls in Objective-C

Generation Data Matrix ECC200 in Objective-C Figure 3 9. Overview of autosizing controls

Figure 3 9. Overview of autosizing controls
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In the Autosizing diagram on the left side of Figure 3 9, the outer box represents the object s container in this case, the window and the inner box represents the object itself. Note that although I keep referring to resizing the Table View, in fact the thing you are resizing is its container, which is a Scroll View. It s not a problem, since the two keep in sync. For simplicity, I will talk about the control that we re interested in, not the Scroll View that contains it. The red I bars show how the object is anchored to its container, and the red arrows within the object show how the object s size will change. Making a red I bar solid (by clicking on it) means you want to anchor the object in that direction. The left and top edges of the Table View are anchored to the top and left edges of the window, and will stay the same distance from them when the window is resized. Making either the horizontal or vertical arrows within the object solid means you want the object to resize in that direction. You can see that the Table View will not resize at all. I found this rather counter-intuitive when I first encountered it, but a little experimentation cemented the rules in my mind. The animation on the right side of Figure 3 9 gives an indication of how the object will behave as the result of your settings. Let s get this Table View to resize correctly now. First of all, the anchoring at the top and left is OK, but you also want it anchored to the bottom. Second, the Table View needs to stretch vertically but not horizontally. Click the bottom I bar and the vertical arrow (it should look like the settings in Figure 3 10). It might seem at first glance that just choosing the sizing arrow is enough to make the Table View stretch vertically; however, it doesn t work quite correctly, because as you make the window taller the resizing doesn t keep the bottom gap constant. Anchoring the bottom edge too makes sure it stays in place. Run the simulator ( R) to confirm that the Table View is behaving as expected. Now go ahead and set the remaining user interface components up. Refer to Table 3 1 and Figure 3 10 to see how each one should be configured.
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CHAPTER 3: Interface Builder
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Figure 3 10. Autosizing properties for the user interface components Table 3 1. Autosizing properties for the user interface components
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Table View 1 Table View 2 Search View Label Text View
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Top, left, bottom Top, right, left Top, right, left Top, left Top, right, bottom, left
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There is one more problem you need to resolve. Although the user interface components now behave impeccably when you make the window bigger than its initial value, making it smaller leads to some ugliness. The controls try to make a good job of what you ve asked them to do, but of course you get to a point where things just don t fit. The simplest way to resolve this is to set a minimum size for the window. Click on the window title bar to select it, then choose the Size tab in the Inspector. Check the Has
CHAPTER 3: Interface Builder
minimum size checkbox and enter the width and height (550 and 450, respectively) or click the Use Current button to pick up the window size settings. Run the simulator again. Now your controls will resize when you expand the window, but the window will never get smaller than the size set here as the minimum, so you can avoid any resizing unpleasantness. You can also set maximum size values in this Inspector if you want to constrain your window in this way.
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