iOS画板实现第二波

时间 2019-12-11

标签 ios 画板实现第二栏目 iOS 繁體版

原文原文链接

#####画板实现第二波 #####1.将对图片添加一系列手势操做，原有实现不能实现git

之前详细说明个六种手势在控件上的操做（手势只能添加在控件上）
对原有代码进行改造

#####1.1添加一个图片处理的VIEWgithub

-(void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{
    NSLog(@"%@",info);
    UIImage *image=info[UIImagePickerControllerOriginalImage];

    HYLImageHandleView *imageHandView=[[HYLImageHandleView alloc]initWithFrame:self.drawView.bounds];
    [self.drawView addSubview:imageHandView];
    imageHandView.imageView.image=image;

    [self dismissViewControllerAnimated:YES completion:nil];
}

#####1.2图片view中一些设置atom

#pragma mark - setter/getter
-(UIImageView *) imageView{
    if (_imageView==nil) {
        UIImageView *imageView=[[UIImageView alloc]initWithFrame:self.bounds];
        _imageView=imageView;
        [self addSubview:_imageView];
    }
    return _imageView;
}

#pragma mark -drawRect
- (void)drawRect:(CGRect)rect {

}

#####2.添加各类手势.net

-(instancetype) initWithFrame:(CGRect)frame{
    if (self=[super initWithFrame:frame]) {
        [self setPan];
        [self setLongPress];
        [self setRotation];
        [self setPinch];
    }
    return self;
}

#pragma mark - setpan
-(void) setPan{
    UIPanGestureRecognizer *pan=[[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(pan:)];
    [self.imageView addGestureRecognizer:pan];
}
-(void) pan:(UIPanGestureRecognizer *)pan{

}
#pragma mark -setLongPress
-(void) setLongPress{
    UILongPressGestureRecognizer *longPress=[[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longPress:)];
    [self.imageView addGestureRecognizer:longPress];
}
-(void) longPress:(UILongPressGestureRecognizer *)longPress{

}

#pragma mark - setRotation
-(void) setRotation{
    UIRotationGestureRecognizer *rotation=[[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(rotation:)];
    [self.imageView addGestureRecognizer:rotation];
}
-(void) rotation:(UIRotationGestureRecognizer *)rotation{

}
#pragma mark -setPinch
-(void) setPinch{
    UIPinchGestureRecognizer *pinch=[[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(pinch:)];
    [self.imageView addGestureRecognizer:pinch];
}
-(void) pinch:(UIPinchGestureRecognizer *)pinch{

}

#####3.对于手势没法响应问题的解决 #####3.1解决的方法：首先检查这个控件是否能响应事件，如：imageView，还有就是控件的父控件就不能响应code

-(UIImageView *) imageView{
    if (_imageView==nil) {
        UIImageView *imageView=[[UIImageView alloc]initWithFrame:self.bounds];
        _imageView=imageView;
        //注意点，容许用户交互，不能响应事件时通常查这个
        _imageView.userInteractionEnabled=YES;
        self.backgroundColor=[UIColor clearColor];
        [self setPan];
        [self setLongPress];
        [self setRotation];
        [self setPinch];
        [self addSubview:_imageView];
    }
    return _imageView;
}

#####3.2手势里面的写法差很少 #####4.介绍block的一种用法，用来解决耦合 #####4.1当操做了手势后，想保存图片到drawView上时对象

1.self.superView能够得到，再强转，耦合
2.使用block：在ImageHandleView.h中定义，在viewControoler.m中写好要执行的代码（因国在viewControoler中能够得到drawView对象），在图片处理完时执行此block（在imageHandleView.m执行）
代码依从2所说来写(具体代码请看github)

/** imageHandleCompletionBlock*/
@property (nonatomic,strong) void (^imageHandleCompletionBlock)(UIImage *image);

//保存一份代码，当图片处理完时调用；
    imageHandView.imageHandleCompletionBlock=^(UIImage *image){
        self.drawView.image=image;
    };

// self.imageView.image=image;
    //重画drawView，执行block
    if (self.imageHandleCompletionBlock) {
        self.imageHandleCompletionBlock(image);
    }

#####5.源代码详细地址事件