ln-ios/ln_jq_app/ios/AMapNavIOSSDK/AMapNavIOSSDK/Classes/Class/ACustomAnnotationView.m

//
//  ACustomAnnotationView.m
//  AMapNavIOSSDK
//
//  Created by admin on 2026/3/17.
//

#import "ACustomAnnotationView.h"

// ─── 布局常量 ─────────────────────────────────────────────────────────────────
static const CGFloat kIconSize      = 30;   // 图标宽高
static const CGFloat kIconTextGap   =  6.0;   // 图标与文字间距
static const CGFloat kMaxTextWidth  = 100.0;  // 文字区域最大宽度
static const CGFloat kMaxTextLines  =  2;     // 最多行数
static const CGFloat kVPad          =  4.0;   // 整体上下内边距（用于 centerOffset 微调）

@interface ACustomAnnotationView ()

@property (nonatomic, strong) UIImageView *iconView;
@property (nonatomic, strong) UILabel     *titleLabel;

/// 当前是否选中（用于更新图标 & 文字样式）
@property (nonatomic, assign) BOOL isAnnotationSelected;

@end

@implementation ACustomAnnotationView

#pragma mark - Init / Reuse

- (instancetype)initWithAnnotation:(id<MAAnnotation>)annotation
                   reuseIdentifier:(NSString *)reuseIdentifier {
    self = [super initWithAnnotation:annotation reuseIdentifier:reuseIdentifier];
    if (self) {
        self.backgroundColor = [UIColor clearColor];
        // 关闭 MAAnnotationView 自带的 image 渲染，避免干扰
        self.image = nil;
        [self _buildSubviews];
        [self _updateFromAnnotation];
        [self setNeedsLayout];
    }
    return self;
}

- (void)setAnnotation:(id<MAAnnotation>)annotation {
    [super setAnnotation:annotation];
    [self _updateFromAnnotation];
    [self setNeedsLayout];
}

#pragma mark - Build

- (void)_buildSubviews {
    // ── 图标 ──────────────────────────────────────────────────
    if (!self.iconView) {
        UIImageView *iv = [[UIImageView alloc] init];
        iv.contentMode = UIViewContentModeScaleAspectFit;
        [self addSubview:iv];
        self.iconView = iv;
    }

    // ── 文字 ──────────────────────────────────────────────────
    if (!self.titleLabel) {
        UILabel *lbl = [[UILabel alloc] init];
        lbl.numberOfLines   = kMaxTextLines;
        lbl.lineBreakMode   = NSLineBreakByTruncatingTail;
        lbl.textAlignment   = NSTextAlignmentLeft;
        [self addSubview:lbl];
        self.titleLabel = lbl;
    }

    // 初始化为默认（未选中）样式
    [self _applyStyle:NO];
}

/// 根据选中状态切换图标 & 文字样式
- (void)_applyStyle:(BOOL)selected {
    if (selected) {
        self.iconView.image     = [AMapNavCommonUtil imageWithName3x:@"station_select_icon"];
        self.titleLabel.font    = [UIFont boldSystemFontOfSize:14];
        self.titleLabel.textColor = [UIColor colorWithWhite:0.12 alpha:1.0];
    } else {
        self.iconView.image     = [AMapNavCommonUtil imageWithName3x:@"station_normal_icon"];
        self.titleLabel.font    = [UIFont systemFontOfSize:13];
        self.titleLabel.textColor = [UIColor colorWithWhite:0.25 alpha:1.0];
    }
}

#pragma mark - Data

- (void)_updateFromAnnotation {
    NSString *text = nil;
    id<MAAnnotation> ann = self.annotation;
    if ([ann respondsToSelector:@selector(title)]) {
        text = ann.title;
    }
    if (text.length == 0) {
        text = @"加氢站";
    }
    self.titleLabel.text = text;
}

#pragma mark - Selection（MAAnnotationView 官方选中回调）

- (void)setSelected:(BOOL)selected animated:(BOOL)animated {
    [super setSelected:selected animated:animated];
    self.isAnnotationSelected = selected;
    [self _applyStyle:selected];
    [self setNeedsLayout];
}

#pragma mark - Layout

- (void)layoutSubviews {
    [super layoutSubviews];

    // 文字最大 100pt、最多 2 行
    CGSize textConstraint = CGSizeMake(kMaxTextWidth,
                                       CGFLOAT_MAX);
    CGSize textFit = [self.titleLabel sizeThatFits:textConstraint];
    // 高度上限：2 行
    CGFloat lineH    = self.titleLabel.font.lineHeight;
    CGFloat maxTextH = lineH * kMaxTextLines
                       + self.titleLabel.font.leading * (kMaxTextLines - 1);
    CGFloat textW    = MIN(textFit.width,  kMaxTextWidth);
    CGFloat textH    = MIN(textFit.height, maxTextH);

    CGFloat totalW   = kIconSize + kIconTextGap + textW;
    CGFloat totalH   = MAX(kIconSize, textH) + kVPad * 2;

    // 更新自身 bounds
    self.bounds = CGRectMake(0, 0, totalW, totalH);

    // 图标：垂直居中
    CGFloat iconY = (totalH - kIconSize) * 0.5;
    self.iconView.frame = CGRectMake(0, iconY, kIconSize, kIconSize);

    // 文字：垂直居中
    CGFloat textY = (totalH - textH) * 0.5;
    self.titleLabel.frame = CGRectMake(kIconSize + 1, textY, textW, textH);

    // 锚点：让图标底部对齐地图坐标点
    // MAAnnotationView 的 centerOffset 以 (0,0)=中心 为原点
    // 默认选中图标底部对准坐标：向上偏移 totalH/2
    self.centerOffset = CGPointMake(totalW / 2.0 - kIconSize / 2.0,
                                    -(totalH / 2.0));
}

#pragma mark - Hit Test

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    UIView *hit = [super hitTest:point withEvent:event];
    if (hit == self || [hit isDescendantOfView:self]) {
        return self;
    }
    return hit;
}

#pragma mark - Touch

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    [super touchesBegan:touches withEvent:event];

    id<MAAnnotation> annotation = self.annotation;
    if (!annotation) return;

    UIView *sv = self.superview;
    while (sv && ![sv isKindOfClass:[MAMapView class]]) {
        sv = sv.superview;
    }
    MAMapView *mapView = (MAMapView *)sv;
    if (!mapView) return;

//    [mapView deselectAnnotation:annotation animated:NO];
}

@end