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iOS Ui爬坑记

导航栏设置

在AppDelegate .swift中的application 函数实现全局

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let mainPage = ViewController()
let navRoot = UINavigationController(rootViewController: mainPage)
navRoot.navigationBar.isTranslucent = true//是否透明
window = UIWindow(frame: UIScreen.main.bounds)
window?.backgroundColor = UIColor.white
window?.rootViewController = navRoot//根目录

添加导航栏按钮：

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let rightIteam:UIBarButtonItem = UIBarButtonItem(image: UIImage(named:"duty_choicemore"), style: UIBarButtonItemStyle.plain, target: self, action: #selector(Tapdown(_:)))
   self.navigationItem.rightBarButtonItem = rightIteam

SnapKit库

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let label  = UILabel(frame: CGRect(x: 70, y: 20, width: 100, height: 50))
        self.view.addSubview(label)
        label.snp.makeConstraints{(make)->Void in
            make.width.height.equalTo(50);//长宽设置
            make.center.equalTo(self.view)//容器实现
        }
//支持链式调用 
//距离父视图
make.top.equalToSuperview().offset(100)
//大于
make.left.greaterThanOrEqualTo(self.view).offset(20)
//小于
make.left.lessThanOrEqualTo(20) 
//优先级 999>666(max = 999 else @throw)
make.width.equalTo(100).priority(666)
make.width.equalTo(250).priority(999)
//声明约束
//global
var updateConstraint: Constraint?
//method 对某个约束进行绑定
self.updateConstraint = make.top.left.equalTo(10).constraint  
//
 blackView.snp.remakeConstraints