When myLabel.adjustsFontSizeToFitWidth = YES, UILabel will adjust the font size automatically in case the text is too long for the label. For example, if my label is just 100px wide, and my text is too long to fit with the current font size, it will shrink down the font size until the text fits into the label., U
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当-adjustsFontSizeToFitWidth设置为YES时，如何计算UILabel的字体大小？
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