[self.btn setOrigin:CGPointMake(self.btn.origin.x - 20, self.btn.origin.y)];
把btn的距离右边约束拖到代码中,然后设置约束 self.btnRightGap.constant = 50;
[self.btn setCenter:CGPointMake(self.btn.center.x - 20, self.btn.center.y)];
把btn的距离右边约束拖到代码中,然后设置约束 self.btnRightGap.multiplier = 50;
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