iOS开发-CAShapeLayer与UIBezierPath实现微信首页的下拉菜单效果

news2025/11/4 12:13:29

iOS开发-CAShapeLayer与UIBezierPath实现微信首页的下拉菜单效果

之前开发中遇到需要使用实现微信首页的下拉菜单效果。用到了CAShapeLayer与UIBezierPath绘制菜单外框。

在这里插入图片描述

一、效果图

在这里插入图片描述

二、CAShapeLayer与UIBezierPath

2.1、CAShapeLayer是什么？

CAShapeLayer继承自CALayer，可使用CALayer的所有属性
CAShapeLayer需要和UIBezierPath绘制图形。

创建shapeLayer

// 创建 shapeLayer
CAShapeLayer *shapeLayer = [[CAShapeLayer alloc]init];
[self.view.layer addSublayer:shapeLayer];
shapeLayer.path = path.CGPath;
shapeLayer.fillColor = [UIColor clearColor].CGColor;
shapeLayer.strokeColor = [UIColor blackColor].CGColor;
shapeLayer.lineWidth = 5;

2.2、UIBezierPath是什么？

UIBezierPath即贝塞尔曲线
UIBezierPath 类允许你在自定义的 View 中绘制和渲染由直线和曲线组成的路径

+ (instancetype)bezierPath;
+ (instancetype)bezierPathWithRect:(CGRect)rect;
+ (instancetype)bezierPathWithOvalInRect:(CGRect)rect;
+ (instancetype)bezierPathWithRoundedRect:(CGRect)rect cornerRadius:(CGFloat)cornerRadius; // rounds all corners with the same horizontal and vertical radius
+ (instancetype)bezierPathWithRoundedRect:(CGRect)rect byRoundingCorners:(UIRectCorner)corners cornerRadii:(CGSize)cornerRadii;
+ (instancetype)bezierPathWithArcCenter:(CGPoint)center radius:(CGFloat)radius startAngle:(CGFloat)startAngle endAngle:(CGFloat)endAngle clockwise:(BOOL)clockwise;
+ (instancetype)bezierPathWithCGPath:(CGPathRef)CGPath;

三、绘制箭头

在弹出的菜单弹出时候会显示箭头，这里使用UIBezierPath和CAShapeLayer绘制箭头。

#pragma mark - DrawShapeLayer
- (void)drawShapeLayer {
    
    CGFloat startPointX = self.contentStartPoint.x;
    CGFloat startPointY = self.contentStartPoint.y;
    
    CGFloat width = CGRectGetWidth(self.contentBGImageView.frame);
    CGFloat height = CGRectGetHeight(self.contentBGImageView.frame);

    self.path = [UIBezierPath bezierPath]; // 创建路径
    [self.path moveToPoint:CGPointMake(startPointX, startPointY)]; // 设置起始点
    
    [self.path addLineToPoint:CGPointMake(startPointX + 5.0, kAnchorHeight)];

    [self.path addLineToPoint:CGPointMake(width - 5.0, kAnchorHeight)];
    
    [self.path addArcWithCenter:CGPointMake(width - 5.0, kAnchorHeight + 5.0) radius:5 startAngle:KCP*3/2 endAngle:2*KCP clockwise:YES]; // 绘制一个圆弧
    
    [self.path addLineToPoint:CGPointMake(width, height - 5.0)];
    
    [self.path addArcWithCenter:CGPointMake(width - 5.0, height - 5.0) radius:5 startAngle:0 endAngle:KCP/2 clockwise:YES]; // 绘制一个圆弧
    [self.path addLineToPoint:CGPointMake(5, height)];
    [self.path addArcWithCenter:CGPointMake(5.0, height-5.0) radius:5 startAngle:KCP/2 endAngle:KCP clockwise:YES]; // 绘制一个圆弧
    
    [self.path addLineToPoint:CGPointMake(0.0, kAnchorHeight + 5.0)];
    
    [self.path addArcWithCenter:CGPointMake(5, kAnchorHeight + 5) radius:5 startAngle:KCP endAngle:KCP*3/2 clockwise:YES]; // 绘制一个圆弧
    
    [self.path addLineToPoint:CGPointMake(startPointX - 5.0, kAnchorHeight)];
    [self.path addLineToPoint:CGPointMake(startPointX, startPointY)];

    self.path.lineWidth     = 2.f;
    self.path.lineCapStyle  = kCGLineCapRound;
    self.path.lineJoinStyle = kCGLineCapRound;
    
    [self.path closePath]; // 封闭未形成闭环的路径
    
    UIGraphicsBeginImageContext(self.contentBGImageView.bounds.size);
    [self.path stroke];
    UIGraphicsEndImageContext();

    self.shapeLayer.path = self.path.CGPath;
}

四、点击触摸的mask处理

当下拉菜单显示后，MaskView上实现touchesBegan可以点击触摸可以隐藏菜单，

INNoteZoneOptionMaskView.h

#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>

@protocol INNoteZoneOptionMaskViewDelegate;
@interface INNoteZoneOptionMaskView : UIView

@property (nonatomic, weak) id<INNoteZoneOptionMaskViewDelegate>maskDelegate;

@end

@protocol INNoteZoneOptionMaskViewDelegate <NSObject>

- (void)optionMaskTouched;

@end

INNoteZoneOptionMaskView.m

#import "INNoteZoneOptionMaskView.h"

@implementation INNoteZoneOptionMaskView

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(nullable UIEvent *)event {
    // 1.自己先处理事件...
    if (self.maskDelegate && [self.maskDelegate respondsToSelector:@selector(optionMaskTouched)]) {
        [self.maskDelegate optionMaskTouched];
    }
    // 2.再调用系统的默认做法，再把事件交给上一个响应者处理
    [super touchesBegan:touches withEvent:event];
}

@end

五、菜单显示

控件显示在keyWindow上

[[UIApplication sharedApplication].keyWindow addSubview:self];

显示动画

- (void)showOption {
    
    self.hidden = NO;
    
    CGPoint anchorPoint = CGPointMake(self.contentStartPoint.x/self.contentBGImageView.frame.size.width, 0.0);
    [self resetAnChorPoint:self.contentBGImageView anchorPoint:anchorPoint];
    self.contentBGImageView.transform = CGAffineTransformMakeScale(0.1, 0.1);
    
    [UIView animateWithDuration:0.25 animations:^{
        self.contentBGImageView.transform = CGAffineTransformMakeScale(1.0, 1.0);
        self.contentBGImageView.alpha = 1.0;
    } completion:^(BOOL finished) {
        
    }];
}

隐藏菜单

- (void)dismissOption {
    [UIView animateWithDuration:0.25 animations:^{
        self.contentBGImageView.transform = CGAffineTransformMakeScale(0.1, 0.1);
        self.contentBGImageView.alpha = 0.0;
    } completion:^(BOOL finished) {
        self.hidden = YES;
        [self removeFromSuperview];
    }];
}

五、菜单完整代码

菜单完整代码如下

INNoteZoneOptionView.h

#import <UIKit/UIKit.h>

/**
 元素的item
 */
typedef void(^OptionTouchBlock)(void);
@interface INNoteZoneOptionItem : NSObject

@property (nonatomic, strong) UIImage *iconImage;
@property (nonatomic, strong) NSString *title;
@property (nonatomic, copy) OptionTouchBlock block;

@end


/**
 按钮控件
 */
@interface INNoteZoneOptionButton : UIControl

@property (nonatomic, strong) UIImage *iconImage;
@property (nonatomic, strong) NSString *title;
@property (nonatomic, assign) BOOL showLine;
@property (nonatomic, strong) INNoteZoneOptionItem *item;

@end


/**
 点击➕号的选项操作
 */
@interface INNoteZoneOptionView : UIView

- (instancetype)initWithFrame:(CGRect)frame anchorPoint:(CGPoint)anchorPoint items:(NSArray *)items;

- (void)showOption;

- (void)dismissOption;

@end

INNoteZoneOptionView.m

#import "INNoteZoneOptionView.h"
#import "UIColor+Addition.h"
#import "UIImageView+WebCache.h"
#import "UIImage+YYAdd.h"
#import "INNoteZoneOptionMaskView.h"

#define KCP 3.1415926

static CGFloat kOpContentWidth = 130.0;
static CGFloat kOpItemHeight = 50.0;

static CGFloat kOpIconSize = 16.0;
static CGFloat kOpMidPadding = 10.0;
static CGFloat kAnchorHeight = 5.0;

static CGFloat kBtnMidPadding = 15.0;

static CGFloat kBtnPadding = 2.0;
static CGFloat kLineHeight = 1.0;

/**
 元素的item
 */
@interface INNoteZoneOptionItem ()


@end


@implementation INNoteZoneOptionItem


@end


/**
 按钮控件
 */
@interface INNoteZoneOptionButton ()

@property (nonatomic, strong) UIImageView *bgImageView;
@property (nonatomic, strong) UIImageView *iconImageView;
@property (nonatomic, strong) UILabel *titleLabel;
@property (nonatomic, strong) UIImageView *lineImageView;

@end

@implementation INNoteZoneOptionButton

- (instancetype)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        [self addSubview:self.bgImageView];
        [self.bgImageView addSubview:self.iconImageView];
        [self.bgImageView addSubview:self.titleLabel];
        [self.bgImageView addSubview:self.lineImageView];
        self.showLine = NO;
    }
    return self;
}

- (void)layoutSubviews {
    [super layoutSubviews];
    
    self.bgImageView.frame = self.bounds;
    self.iconImageView.frame = CGRectMake(kBtnMidPadding, (CGRectGetHeight(self.bounds) - kOpIconSize)/2, kOpIconSize, kOpIconSize);
    self.titleLabel.frame = CGRectMake(CGRectGetMaxX(self.iconImageView.frame) + kBtnMidPadding, 0.0, CGRectGetWidth(self.bgImageView.frame) - (CGRectGetMaxX(self.iconImageView.frame) + kBtnMidPadding*2), CGRectGetHeight(self.bounds));
    self.lineImageView.frame = CGRectMake(0.0, CGRectGetHeight(self.bgImageView.frame) - kLineHeight, CGRectGetWidth(self.bgImageView.frame), kLineHeight);
}

- (void)setIconImage:(UIImage *)iconImage {
    _iconImage = iconImage;
    self.iconImageView.image = iconImage;
    [self setNeedsLayout];
}

- (void)setTitle:(NSString *)title {
    _title = (title?title:@"");
    self.titleLabel.text = _title;
    [self setNeedsLayout];
}

- (void)setShowLine:(BOOL)showLine {
    _showLine = showLine;
    self.lineImageView.hidden = !showLine;
    [self setNeedsLayout];
}

- (void)setHighlighted:(BOOL)highlighted {
    [super setHighlighted:highlighted];
    if (highlighted) {
        self.bgImageView.backgroundColor = [UIColor colorWithHexString:@"f4f4f4"];
    } else {
        self.bgImageView.backgroundColor = [UIColor whiteColor];
    }
}

#pragma mark - SETTER/GETTER
- (UIImageView *)iconImageView {
    if (!_iconImageView) {
        _iconImageView = [[UIImageView alloc] initWithFrame:CGRectZero];
        _iconImageView.contentMode = UIViewContentModeScaleAspectFit;
    }
    return _iconImageView;
}

- (UILabel *)titleLabel {
    if (!_titleLabel) {
        _titleLabel = [[UILabel alloc] initWithFrame:CGRectZero];
        _titleLabel.font = [UIFont boldSystemFontOfSize:14];
        _titleLabel.textColor = [UIColor colorWithHexString:@"131619"];
        _titleLabel.backgroundColor = [UIColor clearColor];
    }
    
    return _titleLabel;
}

- (UIImageView *)bgImageView {
    if (!_bgImageView) {
        _bgImageView = [[UIImageView alloc] initWithFrame:CGRectZero];
        _bgImageView.backgroundColor = [UIColor whiteColor];
        _bgImageView.layer.cornerRadius = 2.0;
        _bgImageView.layer.masksToBounds = YES;
    }
    return _bgImageView;
}

- (UIImageView *)lineImageView {
    if (!_lineImageView) {
        _lineImageView = [[UIImageView alloc] initWithFrame:CGRectZero];
        _lineImageView.backgroundColor = [UIColor colorWithHexString:@"f1f1f1"];
    }
    return _lineImageView;
}

@end

/**
 点击➕号的选项操作
 */
@interface INNoteZoneOptionView ()<INNoteZoneOptionMaskViewDelegate>

@property (nonatomic, strong) INNoteZoneOptionMaskView *maskBGView;
@property (nonatomic, strong) UIImageView *contentBGImageView;
@property (nonatomic, strong) CAShapeLayer *shapeLayer;
@property (nonatomic, strong) UIBezierPath *path;

@property (nonatomic) CGPoint anchorPoint;
@property (nonatomic) CGPoint contentStartPoint;
@property (nonatomic, strong) NSArray *items;

@end

@implementation INNoteZoneOptionView

- (instancetype)initWithFrame:(CGRect)frame anchorPoint:(CGPoint)anchorPoint items:(NSArray *)items {
    self = [super initWithFrame:frame];
    if (self) {
        
        self.anchorPoint = anchorPoint;
        self.items = items;
        
        [self addSubview:self.maskBGView];
        [self addSubview:self.contentBGImageView];
        [self.contentBGImageView.layer addSublayer:self.shapeLayer];
        
        [[UIApplication sharedApplication].keyWindow addSubview:self];
        self.frame = [UIScreen mainScreen].bounds;
        self.hidden = YES;
        
        [self layoutOptionSubviews];

        [self configContentPoint];
        
        [self drawShapeLayer];
        
        [self setupOptionButtons];
    }
    return self;
}

- (void)configContentPoint {
    CGFloat scale = self.anchorPoint.x/self.frame.size.width;
    CGFloat contentWidth = CGRectGetWidth(self.contentBGImageView.frame);
    self.contentStartPoint = CGPointMake(scale*contentWidth - kOpMidPadding, 0.0);
}

- (void)layoutOptionSubviews {
    self.maskBGView.frame = self.bounds;
    self.contentBGImageView.frame = CGRectMake(CGRectGetWidth(self.bounds) - kOpContentWidth - kOpMidPadding, self.anchorPoint.y, kOpContentWidth, self.items.count*kOpItemHeight + kAnchorHeight + 2*kBtnPadding);
    self.shapeLayer.frame = self.contentBGImageView.bounds;
}

#pragma mark - Setup Buttons
- (void)setupOptionButtons {
    NSInteger index = 0;
    for (INNoteZoneOptionItem *item in self.items) {
        INNoteZoneOptionButton *button = [[INNoteZoneOptionButton alloc] initWithFrame:CGRectZero];
        button.frame = CGRectMake(kBtnPadding, kBtnPadding + kAnchorHeight + index*kOpItemHeight, CGRectGetWidth(self.contentBGImageView.frame) - 2*kBtnPadding, kOpItemHeight);
        
        button.iconImage = item.iconImage;
        button.title = item.title;
        button.item = item;
        [self.contentBGImageView addSubview:button];
        [button addTarget:self action:@selector(optionButtonAction:) forControlEvents:UIControlEventTouchUpInside];
        
        button.showLine = YES;
        if (index == self.items.count - 1) {
            button.showLine = NO;
        }
        
        index++;
    }
}

- (void)optionButtonAction:(INNoteZoneOptionButton *)button {
    NSLog(@"点击栏目");
    if (button.item && button.item.block) {
        button.item.block();
    }
}

#pragma mark - Show AND Dismiss
- (void)showOption {
    
    self.hidden = NO;
    
    CGPoint anchorPoint = CGPointMake(self.contentStartPoint.x/self.contentBGImageView.frame.size.width, 0.0);
    [self resetAnChorPoint:self.contentBGImageView anchorPoint:anchorPoint];
    self.contentBGImageView.transform = CGAffineTransformMakeScale(0.1, 0.1);
    
    [UIView animateWithDuration:0.25 animations:^{
        self.contentBGImageView.transform = CGAffineTransformMakeScale(1.0, 1.0);
        self.contentBGImageView.alpha = 1.0;
    } completion:^(BOOL finished) {
        
    }];
}

- (void)dismissOption {
    [UIView animateWithDuration:0.25 animations:^{
        self.contentBGImageView.transform = CGAffineTransformMakeScale(0.1, 0.1);
        self.contentBGImageView.alpha = 0.0;
    } completion:^(BOOL finished) {
        self.hidden = YES;
        [self removeFromSuperview];
    }];
}

#pragma mark - ResetAnChorPoint
/**
 设置动画图钉位置
 
 @param view subView
 */
- (void)resetAnChorPoint:(UIView *)view anchorPoint:(CGPoint)anchorPoint {
    CGPoint oldAnchorPoint = view.layer.anchorPoint;
    view.layer.anchorPoint = anchorPoint;
    [view.layer setPosition:CGPointMake(view.layer.position.x + view.layer.bounds.size.width * (view.layer.anchorPoint.x - oldAnchorPoint.x), view.layer.position.y + view.layer.bounds.size.height * (view.layer.anchorPoint.y - oldAnchorPoint.y))];
}


#pragma mark - INNoteZoneOptionMaskViewDelegate
- (void)optionMaskTouched {
    [self dismissOption];
}

#pragma mark - SETTER/GETTER
- (INNoteZoneOptionMaskView *)maskBGView {
    if (!_maskBGView) {
        _maskBGView = [[INNoteZoneOptionMaskView alloc] initWithFrame:CGRectZero];
        _maskBGView.backgroundColor = [UIColor clearColor];
        _maskBGView.userInteractionEnabled = YES;
        _maskBGView.maskDelegate = self;
    }
    return _maskBGView;
}

- (UIImageView *)contentBGImageView {
    if (!_contentBGImageView) {
        _contentBGImageView = [[UIImageView alloc] initWithFrame:CGRectZero];
        _contentBGImageView.userInteractionEnabled = YES;
        _contentBGImageView.backgroundColor = [UIColor clearColor];
    }
    return _contentBGImageView;
}

- (CAShapeLayer *)shapeLayer {
    if (!_shapeLayer) {
        _shapeLayer = [CAShapeLayer layer];
        _shapeLayer.fillColor = [UIColor whiteColor].CGColor;
        //设置线条的宽度和颜色
        _shapeLayer.lineWidth = 1.0f;
        _shapeLayer.strokeColor = [UIColor colorWithHexString:@"9bb9ef" alpha:0.55].CGColor;
        _shapeLayer.shadowColor = [UIColor colorWithHexString:@"9bb9ef"].CGColor;
        _shapeLayer.shadowOffset = CGSizeMake(-3, 3);
        _shapeLayer.shadowOpacity = 0.3;
        _shapeLayer.shadowRadius = 3.0;
    }
    return _shapeLayer;
}

#pragma mark - DrawShapeLayer
- (void)drawShapeLayer {
    
    CGFloat startPointX = self.contentStartPoint.x;
    CGFloat startPointY = self.contentStartPoint.y;
    
    CGFloat width = CGRectGetWidth(self.contentBGImageView.frame);
    CGFloat height = CGRectGetHeight(self.contentBGImageView.frame);

    self.path = [UIBezierPath bezierPath]; // 创建路径
    [self.path moveToPoint:CGPointMake(startPointX, startPointY)]; // 设置起始点
    
    [self.path addLineToPoint:CGPointMake(startPointX + 5.0, kAnchorHeight)];

    [self.path addLineToPoint:CGPointMake(width - 5.0, kAnchorHeight)];
    
    [self.path addArcWithCenter:CGPointMake(width - 5.0, kAnchorHeight + 5.0) radius:5 startAngle:KCP*3/2 endAngle:2*KCP clockwise:YES]; // 绘制一个圆弧
    
    [self.path addLineToPoint:CGPointMake(width, height - 5.0)];
    
    [self.path addArcWithCenter:CGPointMake(width - 5.0, height - 5.0) radius:5 startAngle:0 endAngle:KCP/2 clockwise:YES]; // 绘制一个圆弧
    [self.path addLineToPoint:CGPointMake(5, height)];
    [self.path addArcWithCenter:CGPointMake(5.0, height-5.0) radius:5 startAngle:KCP/2 endAngle:KCP clockwise:YES]; // 绘制一个圆弧
    
    [self.path addLineToPoint:CGPointMake(0.0, kAnchorHeight + 5.0)];
    
    [self.path addArcWithCenter:CGPointMake(5, kAnchorHeight + 5) radius:5 startAngle:KCP endAngle:KCP*3/2 clockwise:YES]; // 绘制一个圆弧
    
    [self.path addLineToPoint:CGPointMake(startPointX - 5.0, kAnchorHeight)];
    [self.path addLineToPoint:CGPointMake(startPointX, startPointY)];

    self.path.lineWidth     = 2.f;
    self.path.lineCapStyle  = kCGLineCapRound;
    self.path.lineJoinStyle = kCGLineCapRound;
    
    [self.path closePath]; // 封闭未形成闭环的路径
    
    UIGraphicsBeginImageContext(self.contentBGImageView.bounds.size);
    [self.path stroke];
    UIGraphicsEndImageContext();

    self.shapeLayer.path = self.path.CGPath;
}

@end

六、使用显示下拉菜单

使用显示下拉菜单代码，根据anchorPoint确定显示的箭头位置

#pragma mark - INNoteZoneNavbarViewDelegate
- (void)addButtonDidAction:(UIButton *)button {
    CGRect btnRect = [button convertRect:button.bounds toView:[UIApplication sharedApplication].keyWindow];
    
    __weak typeof(self) weakSelf = self;
    INNoteZoneOptionItem *postItem = [[INNoteZoneOptionItem alloc] init];
    postItem.iconImage = [UIImage imageNamed:@"ic_op_editpost"];
    postItem.title = @"发布帖子";
    postItem.block = ^{
        NSLog(@"发布帖子");
    };
    
    INNoteZoneOptionItem *scanItem = [[INNoteZoneOptionItem alloc] init];
    scanItem.iconImage = [UIImage imageNamed:@"ic_op_scan"];
    scanItem.title = @"扫一扫";
    scanItem.block = ^{
        NSLog(@"扫一扫");
    };
    
    INNoteZoneOptionItem *calItem = [[INNoteZoneOptionItem alloc] init];
    calItem.iconImage = [UIImage imageNamed:@"ic_op_cal"];
    calItem.title = @"日历";
    calItem.block = ^{
        NSLog(@"日历");
    };
    
    INNoteZoneOptionItem *pubWordItem = [[INNoteZoneOptionItem alloc] init];
    pubWordItem.iconImage = [UIImage imageNamed:@"ic_op_edit"];
    pubWordItem.title = @"发布美句";
    pubWordItem.block = ^{
        NSLog(@"发布美句");
    };

    INNoteZoneOptionView *optionView = [[INNoteZoneOptionView alloc] initWithFrame:CGRectZero anchorPoint:CGPointMake(CGRectGetMidX(btnRect), CGRectGetMaxY(btnRect)) items:@[postItem,scanItem,calItem,pubWordItem]];
    [optionView showOption];
}

七、小结

iOS开发-CAShapeLayer与UIBezierPath实现微信首页的下拉菜单效果。用到了CAShapeLayer与UIBezierPath绘制菜单外框。
学习记录，每天不停进步。

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