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Sometimes I want to know what column my cursor is at, so I can see how many characters I have left til the print margin.
This is a common functionality in most IDEs and text editors, but I couldn't find it in Xcode.
Is it possible to enable this or see it somewhere?
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The left-most column in the Code Editor which contains the line numbers is known as the Gutter. Blue arrow-tabs present in the gutter are "breakpoint indicators". Breakpoints are a part of the debugging process that we'll teach you about later. Above: Xcode when encountering a breakpoint.
If you want to add multiple cursors at the same column, instead of wasting time aiming and clicking, you can use the arrow key to navigate. Hold ⌃ – Control and ⇧ - SHIFT then ↑ or ↓ to add cursors to the line above and below your current position. You can deselect a cursor by hit the arrow in the opposite direction.
Open Xcode's Preferences, go to the Text Editing tab, Editing subtab, and check the "Page guide at column: 80" box. That will display a vertical line at 80 columns in the editor.
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