使用minimumScaleFactor时，UIButton的titleLabel未垂直居中

Question

我有一个UIButton，按钮上的文本通常会居中显示，但当文本字符串变长时，文本的大小会缩小。这时，文本似乎会粘在textField的底部而不是保持在按钮中央。

self.titleBtn.titleLabel.adjustsFontSizeToFitWidth = YES;
self.titleBtn.titleLabel.minimumScaleFactor = .2;

[self.descriptionBtn setTitle:@"T" forState:UIControlStateNormal]; 
//works normally

但是

[self.descriptionBtn setTitle:@"This a longer title" forState:UIControlStateNormal];
//is vertically lower than center

- Chase Roberts

Answer 1

如此处所述 :)
您需要使用UILabel的baselineAdjustment属性
label.baselineAdjustment = UIBaselineAdjustmentAlignCenters

- tt.Kilew

Answer 2

Swift 3

label.baselineAdjustment = .alignCenters

对于按钮

button.titleLabel?.baselineAdjustment = .alignCenters

- dimohamdy