2022-12-16 ios解决涂鸦时外层view的点击事件传递不进来的Bug

1 通过自定义view实现涂鸦，当点击换颜色时点击事件不生效，发现原因是没有设置自定义view的背景色为clearColor,
一定要加上这行代码： self.backgroundColor = [UIColor clearColor];
自定义view如下：
DrawPath.h

#import <UIKit/UIKit.h>

NS_ASSUME_NONNULL_BEGIN

@interface DrawPath : UIBezierPath
@property (nonatomic,strong) UIColor *pathColor;
@end

NS_ASSUME_NONNULL_END

DrawPath.m文件无代码

DrawPath.h 文件

#import <UIKit/UIKit.h>
#import "DrawPath.h"
NS_ASSUME_NONNULL_BEGIN

@interface DrawView : UIView
@property (nonatomic,strong) DrawPath *path;
@property (nonatomic,strong) NSMutableArray *pathArray;
@property (nonatomic,assign) float lineWidth;
@property (nonatomic,strong) UIColor *lineColor;
@property (nonatomic,strong) UIImage *image;

-(void)clear;
-(void)unDo;
-(void)setUp;
@end

NS_ASSUME_NONNULL_END

DrawView.m文件

#import "DrawView.h"
#import "LRessSourceMaterialCommon.h"
@implementation DrawView

#pragma mark - 初始化设置
- (void)setUp{
    //给view添加一个是手势

    UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc]init];
    
    [panGesture addTarget:self action:@selector(pan:)];
    [self addGestureRecognizer:panGesture];
    self.backgroundColor = [UIColor clearColor];
  //  self.path.pathColor = [UIColor blackColor];
}

-(NSMutableArray *)pathArray{
    if (_pathArray == nil)
    {
        _pathArray = [NSMutableArray array];
    }
    return _pathArray;
}

-(void)pan:(UIPanGestureRecognizer *)pan{
    
    CGPoint currentP = [pan locationInView:self];

    if (pan.state == UIGestureRecognizerStateBegan){
        
        self.path = [[DrawPath alloc]init];
        self.path.lineWidth = self.lineWidth;
        self.path.pathColor = self.lineColor;
        
        //起点
        [self.path moveToPoint:currentP];
        //保存描述好的路径
        [self.pathArray addObject:self.path];
        NSArray *numViews = self.superview.subviews;
        for(int i=0;i<numViews.count;i++){
            if([numViews[i] isKindOfClass:(UIButton.class)]){
                UIButton *button = numViews[i];
                NSInteger tagId=button.tag;
                if(tagId==11){
                    [button setBackgroundImage:LRSourceMaterialImage(@"lr_source_cancel_s") forState:UIControlStateNormal];
                    [button setUserInteractionEnabled:YES];
                }else if(tagId==12){
                    [button setBackgroundImage:LRSourceMaterialImage(@"lr_source_clear_s") forState:UIControlStateNormal];
                    [button setUserInteractionEnabled:YES];
                }
            }
        }
    }

    [self.path addLineToPoint:currentP];
    [self setNeedsDisplay];
}

#pragma mark-
-(void)drawRect:(CGRect)rect{
    
    for (DrawPath *path in self.pathArray) {
    
        if ([path isKindOfClass:[UIImage class]]){
            
            //绘制图片
            UIImage *image = (UIImage *)path;
            [image drawInRect:rect];
        }else{
            //画线
            [path.pathColor set];
            [path stroke];

        }
        
    }

}
-(void)clear{
    [self.pathArray removeAllObjects];
    [self setNeedsDisplay];
}
-(void)unDo{
    [self.pathArray removeLastObject];
    [self setNeedsDisplay];
}

-(void)setImage:(UIImage *)image{
    
    _image = image;
    [self.pathArray addObject:_image];
    [self setNeedsDisplay];
}

@end

在viewController里面调用如下：

@property (nonatomic, strong) DrawView *drawView;

- (DrawView *)drawView {
    if(!_drawView){
        _drawView  = [[DrawView alloc]initWithFrame:self.view.frame];
        _drawView.lineColor = MAHexColor(@"0XE75E58");
        _drawView.lineWidth= kLRAdaptSize(4.5);
        [_drawView setUp];
    }
    return  _drawView;
}

[self.view addSubview:self.drawView];