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This article introduces the relevant knowledge of "how to solve the text jump problem of UILabel display timer". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

First, let's take a look at a problematic display:

The above gif diagram will find problems with jumping and flickering when displaying the CAPTCHA count. Currently, most of the controls used to implement timer display are UILabel.

Before iOS9, the default English font was Helvetica, in which the width of each number was equal. After iOS9, the default English font is changed to San Fransico font, in which the width of each number is not equal.

It is precisely because of the unequal width of numbers that leads to the problem of text bounce and flicker when displaying timer text with UILabel. Therefore, the solution is to choose a digital font of equal width to display. There are two solutions to this:

Default font with Helvetica font code.

UILabel * label = [UILabel new]; label.font = [UIFont fontWithName:@ "Helvetica" size:16]

Use UIFont's new API: + (UIFont *) monospacedSystemFontOfSize: (CGFloat) fontSize weight: (UIFontWeight) weight

UILabel * label = [UILabel new]; / / remember that this API is not valid until it is iOS9! Label.font = [UIFont monospacedSystemFontOfSize:16 weight:UIFontWeightRegular]

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