Question

我正在尝试创建自己的UIImageView处理程序。我设法将必要的触摸事件子类化。我还没想出如何添加自己的属性。我想添加一个UIColor属性来设置我的处理程序的笔触颜色。这是.h文件。

//
//  imageViewController.h
//  slate
//
//  Created by House of Pawn on 11/15/17.
//  Copyright © 2017 ma. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface imageViewController : UIImageView

@end

这是.m文件

//
//  imageViewController.m
//  slate
//
//  Created by House of Pawn on 11/15/17.
//  Copyright © 2017 ma. All rights reserved.
//

#import "imageViewController.h"

@interface imageViewController ()



@end

@implementation imageViewController
CGPoint lastPoint;
CGFloat red;
CGFloat green;

NSString const *key = @"my.very.unique.key";

CGFloat blue;
CGFloat brush;
CGFloat opacity;
UIColor* strokeColor;
BOOL mouseSwiped;



- (void)viewDidLoad {
  //  [super viewDidLoad];
    // Do any additional setup after loading the view.
}

- (void)didReceiveMemoryWarning {
 //   [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{

    mouseSwiped = NO;

    UITouch *touch = [touches anyObject];
    lastPoint = [touch locationInView:self];

    NSLog(@"Touches Began");
}


- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {

    mouseSwiped = YES;
    UITouch *touch = [touches anyObject];
    CGPoint currentPoint = [touch locationInView:self];

    UIGraphicsBeginImageContext(self.frame.size);

    [self.image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
    CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
    CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), currentPoint.x, currentPoint.y);
    CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
    CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 30.0 );


    CGFloat* components = CGColorGetComponents(_strokeColor.CGColor);


    CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), components[0], components[1], components[2], 1.0);
    CGContextSetBlendMode(UIGraphicsGetCurrentContext(),kCGBlendModeNormal);

    CGContextStrokePath(UIGraphicsGetCurrentContext());
    self.image = UIGraphicsGetImageFromCurrentImageContext();
    [self setAlpha:1.0];
    UIGraphicsEndImageContext();

    lastPoint = currentPoint;
}




- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {

    if(!mouseSwiped) {
        UIGraphicsBeginImageContext(self.frame.size);
        [self.image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
        CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
        CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 14.0);
        CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 0, 1, 0, 1);
        CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
        CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
        CGContextStrokePath(UIGraphicsGetCurrentContext());
        CGContextFlush(UIGraphicsGetCurrentContext());
        self.image = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
    }

}





@end

我需要能够像我上面所说的那样将我的自定义UIImageView控制器类传递给UIColor。我想使用的变量是笔触颜色。我看过有关使用类别的帖子，但对我来说没有任何意义。如果有人可以帮助我实现这一点，那就太好了。

Answer 1

要自定义控件，您应该使用IBInspectable＆amp; IBDesignable

对于目标C：使用此链接：https://useyourloaf.com/blog/ib-designable-custom-views-in-interface-builder/

#import <UIKit/UIKit.h>

IB_DESIGNABLE

@interface imageViewController : UIImageView

@property (nonatomic) IBInspectable UIColor *strokeColor;

@end

对于Swift：使用此链接：http://nshipster.com/ibinspectable-ibdesignable/

@IBInspectable var strokeColor: UIColor? {
   didSet {
       layer.borderColor = borderColor?.CGColor
   }
}

谢谢。

向自定义类添加属性

1 个答案: