//实例化一个view
UIView*redView = [UIViewnew];
redView.backgroundColor= [UIColorredColor];
[self.viewaddSubview:redView];
UIView*blueView = [UIViewnew];
blueView.backgroundColor= [UIColorblueColor];
[self.viewaddSubview:blueView];
//masonry自动帮我们把autoresizing给禁用掉
/**
更新约束
updateConstraints:
更新redView的约束高度变为80
[redView updateConstraints:^(MASConstraintMaker *make) {
make.height.equalTo(80);
}];
*/
/**
重新设置,会把之前的约束给清空掉,然后使用新的约束
remakeConstraints :
[redView remakeConstraints:^(MASConstraintMaker *make) {
make.top.left.offset(20);
make.right.offset(-20);
make.height.equalTo(80);
}];
*/
/**
设置约束的优先级
.priority(10)
[redView makeConstraints:^(MASConstraintMaker *make) {
make.top.left.offset(20);
make.right.offset(-20);
//make.height.equalTo(40).priorityLow();
make.height.equalTo(40).priority(10);
}];
[redView makeConstraints:^(MASConstraintMaker *make) {
make.height.equalTo(80).priority(20);
}];
*/
[redViewmakeConstraints:^(MASConstraintMaker*make) {
//make.top.left.offset(20);
//针对topLayoutGuide进行设置
// self.mas_bottomLayoutGuide设置底部
// self.mas_topLayoutGuideBottom设置顶部
make.top.equalTo(self.mas_topLayoutGuideBottom);
make.left.offset(20);
make.right.offset(-20);
make.height.equalTo(40);
}];
//设置blueView的约束
/**
dividedBy :除以
multipliedBy :乘以
*/
[blueViewmakeConstraints:^(MASConstraintMaker*make) {
make.top.equalTo(redView.bottom).offset(20);
make.right.offset(-20);
make.height.equalTo(redView);
//宽度
//make.width.equalTo(redView).multipliedBy(0.5);
make.width.equalTo(redView).dividedBy(2);
}];
//更新
[redViewupdateConstraints:^(MASConstraintMaker*make) {
make.height.equalTo(80);
}];
