前言
自定义控件的时候，经常会不仅在代码中创建该控件，现在还越来越多的在Storyboard和XIB中直接创建，如果仅仅是为了修改某些属性，或者在运行过程中不需要修改的东西，我们就不需要每次都拖线，修改属性。
示例1：按钮的圆角、边框
在可视化创建UI的过程中，总有需要设置按钮的圆角、边框的情况，在最开始，作者都是使用的 1.拖线，2.修改属性。此类方法。
后来发现,可以直接在User Defined Runtime Attributes中添加运行时修改的属性，于是，再也不需要为仅仅做展示用的一些控件拖线来修改layer了。
注：上图中的borderColorFromUIColor和shadowColorFromUIColor用于设置边框颜色和阴影颜色，直接设置是UIColor，但对应的属性是CGColor，所以需要为CALayer添加分类：
#import <QuartzCore/QuartzCore.h>
#import <UIKit/UIKit.h>
@interface CALayer (Addition)
@property(nonatomic, strong) UIColor *borderColorFromUIColor;
@property(nonatomic, strong) UIColor *shadowColorFromUIColor;
- (void)setBorderColorFromUIColor:(UIColor *)color;
- (void)setShadowColorFromUIColor:(UIColor *)color;
@end
#import "CALayer+Addition.h"
#import <objc/runtime.h>
@implementation CALayer (Addition)
//static const void *borderColorFromUIColorKey = &borderColorFromUIColorKey;
//@dynamic borderColorFromUIColor;
- (UIColor *)borderColorFromUIColor {
return objc_getAssociatedObject(self, @selector(borderColorFromUIColor));
}
-(void)setBorderColorFromUIColor:(UIColor *)color
{
objc_setAssociatedObject(self, @selector(borderColorFromUIColor), color, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
[self setBorderColorFromUI:self.borderColorFromUIColor];
}
- (void)setBorderColorFromUI:(UIColor *)color
{
self.borderColor = color.CGColor;
}
- (UIColor *)shadowColorFromUIColor {
return objc_getAssociatedObject(self, @selector(shadowColorFromUIColor));
}
-(void)setShadowColorFromUIColor:(UIColor *)color
{
objc_setAssociatedObject(self, @selector(shadowColorFromUIColor), color, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
[self setShadowColorFromUI:self.borderColorFromUIColor];
}
- (void)setShadowColorFromUI:(UIColor *)color
{
self.shadowColor = color.CGColor;
}
@end
但是后来发现，每次都为了添加圆角，复制一大堆Key Path：
- layer.cornerRadius
- layer.borderWidth
- layer.borderColorFromUIColor
- layer.masksToBounds
然后修改值，不仅手酸，还不能直接XIB文件中看到效果，必须运行起来查看。
于是就找到了新的方法：IB_DESIGNABLE / IBInspectable，不过目前只能用于UIView的子类
具体方法如下：
import UIKit
//@IBDesignable告诉编译器，此类可以被nib识别使用
@IBDesignable class BoardButton: UIButton {
//@IBInspectable告诉编译器,这个属性是可视化的
@IBInspectable var borderWidth : CGFloat = 0{
didSet{
layer.borderWidth = borderWidth
}
}
@IBInspectable var borderColor : UIColor = UIColor.clear{
didSet{
layer.borderColor = borderColor.cgColor
}
}
@IBInspectable var cornerRadius : CGFloat = 0{
didSet{
layer.cornerRadius = cornerRadius
}
}
@IBInspectable var masksToBounds : Bool = false{
didSet{
layer.masksToBounds = masksToBounds
}
}
}
这样直接在XIB文件中添加一个UIButton，并设置好约束，修改类别为BoardButton，就可以看到具体的属性了。
这样是不是很轻松呢，以后可以直接把你写好的按钮拿到新的项目中，就可以直接设置layer的一些属性了，你也可以添加阴影，方法是一样的。
示例2：点击上传图片或照片的view
做好了上面的按钮后，正好需要提取一个上传照片的工具类，我就准备把它集成到一个view上面去，先说说这个view的功能：
- 可以预先设置，view的背景颜色
- 可以预先设置，点击view是直接选择照片还是直接拍照，或者弹出提示框，手动选择。（其实这个设置是为了适配公司项目的要求，默认的是手动选择）
- 可以预先设置，是否需要删除按钮（大小及图片），默认需要设置。点击删除按钮，通过闭包传出，外面持有这个view的父控件或者控制器做处理，如果没有删除按钮，再次点击图片，弹出提示框，重新选择图片或删除。
具体实现代码如下：文件名AddImageView.swift
import UIKit
import SVProgressHUD
@IBDesignable class AddImageView: UIView ,UIActionSheetDelegate{
// 成功选择了一张图片
var didSelectedPicture : ((_ imageUrl: String) -> ())?
// 选择图片失败
var failedSelectedPicture : ((_ info: String) -> ())?
// 选择了删除图片
var didClickDeletePicture : (() -> ())?
// 弹出视图的viewController
var presentViewController : UIViewController? = {
return UIApplication.shared.keyWindow?.rootViewController
}()
//删除照片的模式,false:通过点击图片删除,true:通过删除按钮删除
@IBInspectable var bgColor : UIColor = UIColor.white {
didSet {
backgroundColor = bgColor
}
}
//选择相册的模式，如果都选择FALSE，则都改为TRUE
@IBInspectable var fromPhoto : Bool = true {
didSet {
}
}
//选择拍照的模式，如果都选择FALSE，则都改为TRUE
@IBInspectable var fromCamera : Bool = true {
didSet {
}
}
//删除照片的模式,false:通过点击图片删除,true:通过删除按钮删除
@IBInspectable var delbtnBtntype : Bool = false {
didSet {
}
}
//删除按钮图片
@IBInspectable var delbtnImage : UIImage? {
didSet {
}
}
//删除按钮size
@IBInspectable var delbtnSize : CGSize = CGSize(width: 10, height:10) {
didSet {
}
}
// 默认背景图片
@IBInspectable var defaultImage : UIImage?{
didSet{
imageView.image = defaultImage
}
}
//默认背景图片的size
@IBInspectable var defaultImageSize : CGSize = CGSize(width: 10, height:10) {
didSet {
}
}
//选中的照片
var selectedImage : UIImage? {
didSet{
imageView.contentMode = .scaleAspectFit
imageView.image = selectedImage
}
}
// 删除按钮
var deleteButton : UIButton
// 整个ImageView
var imageView : UIImageView
// 图片选择器界面
var imagePickerController: UIImagePickerController?
// 代码创建时
override init(frame: CGRect) {
imageView = UIImageView()
deleteButton = UIButton()
super.init(frame: frame)
addSubview(imageView)
addSubview(deleteButton)
addTapOnImageView()
}
// XIB创建时
required init?(coder aDecoder: NSCoder) {
imageView = UIImageView()
deleteButton = UIButton()
super.init(coder: aDecoder)
addSubview(imageView)
addSubview(deleteButton)
addTapOnImageView()
}
func addTapOnImageView() {
let tap = UITapGestureRecognizer(target: self, action: #selector(tapImageView))
imageView.isUserInteractionEnabled = true
imageView.addGestureRecognizer(tap)
}
@objc private func tapImageView() {
if fromPhoto == true && fromCamera == false {
if selectedImage == nil {//初次选择照片
addPhonto(type:.photoLibrary)
}else{
let alert = UIActionSheet.init(title: nil, delegate: self, cancelButtonTitle: "取消", destructiveButtonTitle: nil, otherButtonTitles: "重新选择","删除")
alert.tag = 103
if presentViewController != nil {
alert.show(in: (presentViewController?.view)!)
}
}
}else if fromPhoto == false && fromCamera == true {
if selectedImage == nil {//初次选择照片
addPhonto(type:.camera)
}else{
let alert = UIActionSheet.init(title: nil, delegate: self, cancelButtonTitle: "取消", destructiveButtonTitle: nil, otherButtonTitles: "重新拍照","删除")
alert.tag = 102
if presentViewController != nil {
alert.show(in: (presentViewController?.view)!)
}
}
}else{
let alert = UIActionSheet.init(title: nil, delegate: self, cancelButtonTitle: "取消", destructiveButtonTitle: nil, otherButtonTitles: "相册","相机")
alert.tag = 101
if presentViewController != nil {
alert.show(in: (presentViewController?.view)!)
}
}
}
func actionSheet(_ actionSheet: UIActionSheet, clickedButtonAt buttonIndex: Int) {
if actionSheet.tag == 101 {
switch buttonIndex {
case 1:
addPhonto(type:.photoLibrary)
case 2:
addPhonto(type:.camera)
default: break
}
}else if actionSheet.tag == 102 {
switch buttonIndex {
case 1:
addPhonto(type:.camera)
case 2:
deletePhoto()
default: break
}
}else if actionSheet.tag == 103 {
switch buttonIndex {
case 1:
addPhonto(type:.photoLibrary)
case 2:
deletePhoto()
default: break
}
}
}
func layoutImageViewAndButton() {
var width_background : CGFloat = 0.0
var height_background : CGFloat = 0.0
var y_background : CGFloat = 0.0
if delbtnBtntype == false{//如果是点击图片的方式删除图片,没有删除按钮
width_background = width
height_background = height
deleteButton.removeFromSuperview()
}else{//如果是点击删除按钮的方式删除图片
y_background = delbtnSize.height / CGFloat(2.0)
width_background = width - delbtnSize.width / 2.0
height_background = height - delbtnSize.height / 2.0
deleteButton.frame = CGRect(origin: CGPoint(x: width_background, y: 0), size: delbtnSize)
deleteButton.addTarget(self, action: #selector(didClickDeleteBtn), for: .touchUpInside)
deleteButton.setBackgroundImage(delbtnImage, for: .normal)
backgroundColor = UIColor.white
let backView = UIView.init(frame: CGRect(x: 0.0, y: y_background, width: width_background, height: height_background))
backView.backgroundColor = bgColor
insertSubview(backView, at: 0)
}
imageView.frame = CGRect(x: 0.0, y: y_background, width: width_background, height: height_background)
if selectedImage == nil{//没有选中的图片了，展示默认图
if defaultImage != nil {//有默认图
if (defaultImageSize.width) <= width_background && (defaultImageSize.height) <= height_background {//设置的默认图的size比自身size小
UIGraphicsBeginImageContextWithOptions(defaultImageSize,false,UIScreen.main.scale)
defaultImage?.draw(in: CGRect(x:0, y:0, width:defaultImageSize.width, height:defaultImageSize.height))
let reSizeImage:UIImage = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext();
imageView.contentMode = .center
imageView.image = reSizeImage
}else{
imageView.contentMode = .scaleAspectFit
imageView.image = defaultImage
}
}
}else{//有选中的图片了，不展示默认图
imageView.contentMode = .scaleAspectFit
}
}
@objc private func didClickDeleteBtn() {
deletePhoto()
}
override func layoutSubviews() {
super.layoutSubviews()
layoutImageViewAndButton()
}
}
extension AddImageView {
func deletePhoto() {
selectedImage = nil
layoutImageViewAndButton()
if didClickDeletePicture != nil {
didClickDeletePicture!()
}
}
func upLoadSeletecdImage(image: UIImage) {
// 上传图片的方法，可以设置到此view中
NetworkTool.sharedInstance.uploadImage(image: selectedImage!, progressing:{(progress:Double)in
SVProgressHUD.showProgress(Float(progress))
},success: { (result, isSuccess) in
SVProgressHUD.dismiss()
if isSuccess{
if let returnUrl = result["body"]["picurl"]["returnUrl"].string {
if self.didSelectedPicture != nil{
self.didSelectedPicture!(returnUrl)
}
}else{
if self.failedSelectedPicture != nil{
self.failedSelectedPicture!("上传图片失败")
}
}
}
}) { (error) in
SVProgressHUD.dismiss()
}
}
}
extension AddImageView: UIImagePickerControllerDelegate, UINavigationControllerDelegate {
//MARK:- present选择照片
func addPhonto(type :UIImagePickerControllerSourceType) {
if UIImagePickerController.isSourceTypeAvailable(type) == false {
if failedSelectedPicture != nil {
failedSelectedPicture!("该设备不支持相机")
}
return
}
imagePickerController = UIImagePickerController()
imagePickerController?.delegate = self
imagePickerController?.sourceType = type
imagePickerController?.allowsEditing = true
// 打开图片选择器
presentViewController?.present(imagePickerController!, animated: true, completion: nil)
}
//MARK: 返回照片信息
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
presentViewController?.dismiss(animated: true, completion: nil)
selectedImage = info[UIImagePickerControllerEditedImage] as? UIImage
if selectedImage != nil{
upLoadSeletecdImage(image: selectedImage!)
}
if failedSelectedPicture != nil && selectedImage == nil {
failedSelectedPicture!("未获取到图片信息")
}
}
}
AddimageView属性
具体内容稍后会放在GitHub并不断优化，欢迎下载尝试。
