LiedouYouxuan/YouHuiProject/YouHui/Base/LDTabbar.m

//
//  LDTabbar.m
//  YouHuiProject
//
//  Created by liuxueli on 2019/2/25.
//  Copyright © 2019 kuxuan. All rights reserved.
//

#import "LDTabbar.h"
#define MCTabBarItemHeight    49.0f
#define AddButtonMargin 15
@interface LDTabbar()

//指向中间“+”按钮



@end
@implementation LDTabbar

- (instancetype)init{
    if (self = [super init]){
        [self initView];
    }
    return self;
}

- (void)initView{
    _centerBtn = [UIButton buttonWithType:UIButtonTypeCustom];
    //去除选择时高亮
    _centerBtn.adjustsImageWhenHighlighted = NO;
    _centerBtn.backgroundColor =[UIColor whiteColor];
   
    [self addSubview:_centerBtn];
}

// 设置layout
- (void)layoutSubviews {
    [super layoutSubviews];
    switch (self.position) {
        case MCTabBarCenterButtonPositionCenter:
            _centerBtn.frame = CGRectMake(([UIScreen mainScreen].bounds.size.width - _centerWidth)/2.0, (MCTabBarItemHeight - _centerHeight)/2.0 + self.centerOffsetY, _centerWidth, _centerHeight);
            break;
        case MCTabBarCenterButtonPositionBulge:
            _centerBtn.frame = CGRectMake(([UIScreen mainScreen].bounds.size.width - _centerWidth)/2.0, -_centerHeight/2.5 + self.centerOffsetY, _centerWidth, _centerHeight);
            break;
        default:
            break;
    }
    // 线的路径
    //第一个参数是起点，是圆形的圆心
    //第二个参数是半径
    //第三个参数是起始弧度
    //第四个参数是结束弧度
    //第五个参数是传入yes是顺时针,no为顺时针，下面的另外一种实现方法的参数意思也是一致
    //path addArcWithCenter:<#(CGPoint)#> radius:<#(CGFloat)#> startAngle:<#(CGFloat)#> endAngle:<#(CGFloat)#> clockwise:<#(BOOL)#>
    
    CGPoint viewCenter = CGPointMake(_centerBtn.frame.size.width / 2.0, _centerBtn.frame.size.height / 2.0); // 画弧的中心点，相对于view
    UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:viewCenter radius:_centerWidth/2 startAngle:-0.18 endAngle:3.32 clockwise:NO];
    CAShapeLayer *pathLayer = [CAShapeLayer layer];
    pathLayer.lineWidth = 1;
    pathLayer.strokeColor = [UIColor colorWithRed:226/255.2 green:226/255.0 blue:226/255.0 alpha:1].CGColor;
    pathLayer.fillColor = nil; // 默认为blackColor
    pathLayer.path = path.CGPath;
    [_centerBtn.layer addSublayer:pathLayer];
    _centerBtn.layer.cornerRadius=_centerWidth/2;
    _centerBtn.layer.masksToBounds=YES;
    [self drawRect:CGRectMake(([UIScreen mainScreen].bounds.size.width - _centerWidth)/2.0, - _centerWidth/2.0, _centerWidth, _centerWidth)];
}

- (void)setCenterImage:(UIImage *)centerImage {
    _centerImage = centerImage;
    // 如果设置了宽高则使用设置的大小
    if (self.centerWidth <= 0 && self.centerHeight <= 0){
        //根据图片调整button的位置(默认居中，如果图片中心在tabbar的中间最上部，这个时候由于按钮是有一部分超出tabbar的，所以点击无效，要进行处理)
        _centerWidth = centerImage.size.width+10;
        _centerHeight = centerImage.size.height+10;
    }
    [_centerBtn setImage:centerImage forState:UIControlStateNormal];
}

- (void)setCenterSelectedImage:(UIImage *)centerSelectedImage {
    _centerSelectedImage = centerSelectedImage;
    [_centerBtn setImage:centerSelectedImage forState:UIControlStateSelected];
}

//处理超出区域点击无效的问题
- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event{
    if (self.hidden){
        return [super hitTest:point withEvent:event];
    }else {
        //转换坐标
        CGPoint tempPoint = [self.centerBtn convertPoint:point fromView:self];
        //判断点击的点是否在按钮区域内
        if (CGRectContainsPoint(self.centerBtn.bounds, tempPoint)){
            //返回按钮
            return _centerBtn;
        }else {
            return [super hitTest:point withEvent:event];
        }
    }
}

@end