1.当 UILabel 左右都有控件时, 需要动态根据屏幕宽度去算出Label的宽度
eg :
// 左面控件为 self.iYellowCircleView 右面控件为 _iScalAllCourseButton
[self.iTitleLabel mas_remakeConstraints:^(MASConstraintMaker *make) {
make.height.mas_equalTo(kAspectHeight(17));
make.centerY.mas_equalTo(self.contentView.mas_centerY);
make.left.mas_equalTo(self.iYellowCircleView.mas_right).offset(kAspectWidth(6));
make.right.mas_equalTo(_iScalAllCourseButton.mas_left).offset(kAspectWidth(-10)).priorityLow();
}];
// 解决约束冲突的方法: 最后一行加上低优先级
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