平分布局

 1 //设置约束
 2 - (void)setTheConstraintForProgress {
 3     //开始
 4     [self.startBtn mas_makeConstraints:^(MASConstraintMaker *make) {
 5         make.top.equalTo(self.view.mas_top).offset(150);
 6         make.left.equalTo(self.view.mas_left).offset(kMargin);
 7         make.height.mas_equalTo(39);
 8     }];
 9     //暂停
10     [self.pauseBtn mas_makeConstraints:^(MASConstraintMaker *make) {
11         make.top.width.height.equalTo(self.startBtn);
12         make.left.equalTo(self.startBtn.mas_right).offset(kMargin);
13         make.right.equalTo(self.continueBtn.mas_left).offset(-kMargin);
14     }];
15     //继续
16     [self.continueBtn mas_makeConstraints:^(MASConstraintMaker *make) {
17         make.top.width.height.equalTo(self.startBtn);
18         make.left.equalTo(self.pauseBtn.mas_right).offset(kMargin);
19         make.right.equalTo(self.againBtn.mas_left).offset(-kMargin);
20     }];
21     //重新
22     [self.againBtn mas_makeConstraints:^(MASConstraintMaker *make) {
23         make.top.width.height.equalTo(self.startBtn);
24         make.right.equalTo(self.view.mas_right).offset(-kMargin);
25     }];
26 }