3.选择

只能选一个，可以取消选择

if (!model.isSelected) {

           for (EMContactSelectDoctorModel *model in weakSelf.list) {

               model.isSelected = NO;

           }

       }

       model.isSelected = !model.isSelected;

       self.selectModel = model;

只能选一个，不能取消

for (EMContactSelectDoctorModel *model in weakSelf.list) {

           model.isSelected = NO;

       }

       model.isSelected = !model.isSelected;

       self.selectModel = model;