FireBoltt_ios/FireBoltt/Extensions/UIBarButtonItem+Custom.swift

//
//  UIBarButtonItem+Custom.swift
//  FireBoltt
//
//  Created by lemo on 2018/5/16.
//  Copyright © 2020年 ecell. All rights reserved.
//

import UIKit

fileprivate struct Metric {
    static let itemMargin: CGFloat = 11 - 8
    // 系统边距 6P：20 其余：16
    static let systemMargin: CGFloat = (-kNavBarItemMargin + Metric.itemMargin)
    static let ios11Imageinset: CGFloat = -(5.0 + 8.0)
}

extension UIBarButtonItem {
    
    /// 导航栏按钮(图片)
    ///
    /// - Parameters:
    ///   - direction: true: 左边 false: 右边
    static func barButtonItem(_ normalImageName: String, _ highImageName: String?, _ target: Any?, _ action: Selector, _ direction: Bool) -> [UIBarButtonItem] {
        
        let button = UIButton(type: .custom)
        let normalImage = UIImage(named: normalImageName)
        button.setImage(normalImage, for: .normal)
        button.frame.size = (normalImage?.size)!
        if highImageName != nil {
            button.setImage(UIImage(named: highImageName!), for: .highlighted)
        }
        button.addTarget(target, action: action, for: .touchUpInside)
        // IOS11 fixedSpace 失效，使用此方法
        if kIOS11 {
            button.imageEdgeInsets = direction ? UIEdgeInsets(top: 0, left: Metric.ios11Imageinset, bottom: 0, right: 0) : UIEdgeInsets(top: 0, left: 0, bottom: 0, right: Metric.ios11Imageinset)
            button.contentHorizontalAlignment = direction ? .left : .right
            return [UIBarButtonItem(customView: button)]
        }
        // 按钮间距为6，6P间距为20，6位16
        let fixedSpace = UIBarButtonItem(barButtonSystemItem: .fixedSpace, target: nil, action: nil)
        fixedSpace.width = Metric.systemMargin
        return [fixedSpace, UIBarButtonItem(customView: button)]
    }
    
    /// 常用导航栏按钮(图片 + 文字)
    ///
    /// - Parameters:
    ///   - direction: true: 左边 false: 右边
    static func baseBarButtonItem(normalImg: String?, highImg: String?, title: String?, target: Any?, action: Selector?) -> UIBarButtonItem {
        let button = UIButton(type: .custom)
        if let normalImg = normalImg {
            button.setImage(UIImage(named: normalImg), for: .normal)
        }
        if let highImg = highImg {
            button.setImage(UIImage(named: highImg), for: .highlighted)
        }
        button.setTitle(title, for: .normal)
        button.titleLabel?.font = SystemMediumFont(18)
        button.setTitleColor(ThemeManagerFrieBoltt.commonTextColor, for: .normal)
        if let action = action {
            button.addTarget(target, action: action, for: .touchUpInside)
        }
        return UIBarButtonItem(customView: button)
    }
    
}