iOS开发之约束特殊用法

我们首先来看一张图

需求：

昵称和时间是两个label，添加约束的时候不能限制宽度

时间label必须全部展示，不能省略，两个label长度大于剩余空间的时候要省略昵称（昵称不限制长度）

第一步：添加相关约束

//名字

[self.name_label mas_makeConstraints:^(MASConstraintMaker*make {

        make.centerY.equalTo(weakSelf.name_imageV.mas_centerY);

        make.left.equalTo(weakSelf.name_imageV.mas_right).offset(pading);

}];

//时间图标

[self.time_imageV mas_makeConstraints:^(MASConstraintMaker*make){

make.centerY.equalTo(weakSelf.name_imageV.mas_centerY);

make.left.equalTo(weakSelf.name_label.mas_right).offset(spaceing);

make.width.height.offset(13);

}];

//时间

[self.time_label mas_makeConstraints:^(MASConstraintMaker*make){

        make.centerY.equalTo(weakSelf.name_imageV.mas_centerY);

        make.left.equalTo(weakSelf.time_imageV.mas_right).offset(pading);

        make.right.lessThanOrEqualTo(weakSelf.superView.mas_right).offset(-50)

;}];

第二步：设置优先级<重点>：懒加载内部要设置这个优先级

- (UILabel *)time_label {

        if (!_time_label) {

                _time_label = [[UILabel alloc] init];

                [_time_label setContentCompressionResistancePriority:UILayoutPriorityRequired forAxis:UILayoutConstraintAxisHorizontal];

        }

    return _time_label;

}

转载原文：iOS开发之约束特殊用法 - 简书