在UIView中繪制以及addSubview

Question

嗨，我想使用Interface Builder在UIView上添加兩個按鈕，並在這兩個按鈕之間繪制一條線。 這怎么可能？ 請提出建議。 謝謝

Answer 1

一個不使用drawrect的簡單選項是將一個薄UIView放在兩個按鈕之間。 將視圖的背景色設置為所需的線條顏色。

編輯：
您仍然可以使用瘦UIView並根據需要切換其可見性。
如果仍然要繪制線條，則可能需要創建一個自定義UIView。

@interface CustomView : UIView {
    UIButton *button1;
    UIButton *button2;
}
@end

@implementation CustomView

- (id) initWithFrame:(CGRect)frame {
    if (self = [super initWithFrame:frame]) {
        UIButton *btn1 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
        btn1.frame = CGRectMake(20, 5, 80, 30);
        [btn1 setTitle:@"Button1" forState:UIControlStateNormal];
        [btn1 addTarget:self action:@selector(buttonPressed:) 
                forControlEvents:UIControlEventTouchUpInside];
        button1 = btn1;
        [self addSubview:btn1];

        UIButton *btn2 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
        btn2.frame = CGRectMake(20, 60, 80, 30);
        [btn2 setTitle:@"Button2" forState:UIControlStateNormal];
        [btn2 addTarget:self action:@selector(buttonPressed:) 
                forControlEvents:UIControlEventTouchUpInside];
        button2 = btn2;
        [self addSubview:btn2];
    }
    return self;
}

-(void)drawRect:(CGRect)rect
{
    CGContextRef context = UIGraphicsGetCurrentContext();
    if (button1.selected)
        CGContextSetRGBStrokeColor(context, 1.0, 0.0, 0.0, 1.0);
    else
        CGContextSetRGBStrokeColor(context, 0.0, 1.0, 0.0, 1.0);
    CGContextSetLineWidth(context, 1.0);
    CGContextBeginPath(context);
    CGContextMoveToPoint(context, 10.0, 45.0);
    CGContextAddLineToPoint(context, 150.0, 45.0);
    if (button1.selected)
    {
        CGContextAddLineToPoint(context, 180.0, 35.0);      
    }
    CGContextDrawPath(context, kCGPathStroke);
}

-(void)buttonPressed:(UIButton *)button
{
    button1.selected = !button1.selected;
    button2.selected = !button2.selected;
    [self setNeedsDisplay];
}

@end