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OStack程序员社区-中国程序员成长平台 › 知识分享 › 知识问答 › ios - 旋转后随机放置的 UILabel 大小错误
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ios - 旋转后随机放置的 UILabel 大小错误

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菜鸟教程小白 发表于 2022-12-11 17:17:02 | 显示全部楼层 |阅读模式 打印 上一主题 下一主题
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有一个 UIVew 容器，用于随机生成、旋转并放置到此 View 中，如果我使用角度 0、90、180、270 看起来不错，但如果角度随机生成的标签看起来扩展了，这对我来说是个问题因为单词应该放置得非常接近并且没有交叉，这看起来像生成器:

- (void) generateUIView *)container
            wordsNSArray *)words
           colorsNSArray *)colors
      minFontSizefloat)minSize
      maxFontSizefloat)maxSize
      rotateWordsBOOL)rotate
    useAngleRangeBOOL)useRange
{
    usingRange = useRange;
    for (int i = 0; i < [words count]; i++) {
        UILabel *word_l = [[UILabel alloc] init];
        word_l.font = [UIFont fontWithName"EuropeBold" size:[self getRandomNumberBetween:minSize toi < probableBigFontWords) ? maxSize : (maxSize / 3)]];
        [word_l setText:words[i]];
        [word_l setTextColor:colors[arc4random_uniform([colors count])]];
        [word_l setBackgroundColor:[UIColor clearColor]];
        [word_l sizeToFit];

        CGRect fr = CGRectMake(0,
                               0,
                               word_l.frame.size.width,
                               word_l.frame.size.height);
        word_l.frame = fr;
        word_l.center = CGPointMake([self getRandomNumberBetween:175 to:639], [self getRandomNumberBetween:175 to:375]);
        if (rotate) {
            int angleType = arc4random_uniform(2);
            if (useRange) {
                int angle = (angleType == 1) ? [self getRandomNumberBetween:0 to:90] : [self getRandomNumberBetween:270 to:360];
                [word_l setTransform:CGAffineTransformMakeRotation(DEGREES_TO_RADIANS(angle))];
            } else {
                [word_l setTransform:CGAffineTransformMakeRotation((angleType == 1) ? DEGREES_TO_RADIANS(270) : DEGREES_TO_RADIANS(360))];
            }
        }
        [container addSubview:word_l];
        while ([self viewIntersectsWithAnotherView:container chosenView:word_l]) {
            viewPositionMovingStep++;
            [self placeItem:container :word_l];
        }
    }
}

- (void)placeItemUIView *)container UILabel *)word_l
{
    CGRect initFr = word_l.frame;
    for (int i = 1; i <= 8; i++) {
        CGRect f = word_l.frame;
        switch (i) {
            case 1:
                f.origin.x = f.origin.x + viewPositionMovingStep;
                break;
            case 2:
                f.origin.x = f.origin.x + viewPositionMovingStep;
                f.origin.y = f.origin.y + viewPositionMovingStep;
                break;
            case 3:
                f.origin.y = f.origin.y + viewPositionMovingStep;
                break;
            case 4:
                f.origin.x = f.origin.x - viewPositionMovingStep;
                f.origin.y = f.origin.y + viewPositionMovingStep;
                break;
            case 5:
                f.origin.x = f.origin.x - viewPositionMovingStep;
                break;
            case 6:
                f.origin.x = f.origin.x - viewPositionMovingStep;
                f.origin.y = f.origin.y - viewPositionMovingStep;
                break;
            case 7:
                f.origin.y = f.origin.y - viewPositionMovingStep;
                break;
            case 8:
                f.origin.x = f.origin.x + viewPositionMovingStep;
                f.origin.y = f.origin.y - viewPositionMovingStep;
                break;
            default:
                break;
        }
        word_l.frame = f;
        if ([self viewIntersectsWithAnotherView:container chosenView:word_l]) {
            word_l.frame = initFr;
        } else {
            viewPositionMovingStep = 0;
            return;
        }
    }
}

-(BOOL)viewIntersectsWithAnotherView:(UIView *)container chosenView:(UIView *)chosenView
{
    for(UIView *view in [container subviews]){
        if (![chosenView isEqual:view]){
            BOOL framePartiallyOut = !CGRectEqualToRect(CGRectIntersection(chosenView.superview.bounds, chosenView.frame), chosenView.frame);
            if (usingRange) {
                if([self view:chosenView intersectsWith:view] || framePartiallyOut){
                    return YES;
                }
            } else {
                if(CGRectIntersectsRect(chosenView.frame, view.frame) || framePartiallyOut){
                    return YES;
                }
            }
        }
    }
    return NO;
}

- (BOOL)view:(UIView *)view1 intersectsWith:(UIView *)view2
{
    CGPoint poly1[4];
    CGRect bounds1 = view1.bounds;
    poly1[0] = [view1 convertPoint:bounds1.origin toView:nil];
    poly1[1] = [view1 convertPoint:CGPointMake(bounds1.origin.x + bounds1.size.width, bounds1.origin.y) toView:nil];
    poly1[2] = [view1 convertPoint:CGPointMake(bounds1.origin.x + bounds1.size.width, bounds1.origin.y + bounds1.size.height) toView:nil];
    poly1[3] = [view1 convertPoint:CGPointMake(bounds1.origin.x, bounds1.origin.y + bounds1.size.height) toView:nil];

    CGPoint poly2[4];
    CGRect bounds2 = view2.bounds;
    poly2[0] = [view2 convertPoint:bounds2.origin toView:nil];
    poly2[1] = [view2 convertPoint:CGPointMake(bounds2.origin.x + bounds2.size.width, bounds2.origin.y) toView:nil];
    poly2[2] = [view2 convertPoint:CGPointMake(bounds2.origin.x + bounds2.size.width, bounds2.origin.y + bounds2.size.height) toView:nil];
    poly2[3] = [view2 convertPoint:CGPointMake(bounds2.origin.x, bounds2.origin.y + bounds2.size.height) toView:nil];

    CGPoint ctl2 = [view1 convertPoint:poly2[0] fromView:nil];
    if (CGRectContainsPoint(view1.bounds, ctl2)){
        return YES;
    }
    CGPoint ctr2 = [view1 convertPoint:poly2[1] fromView:nil];
    if (CGRectContainsPoint(view1.bounds, ctr2)){
        return YES;
    }
    CGPoint cbr2 = [view1 convertPoint:poly2[2] fromView:nil];
    if (CGRectContainsPoint(view1.bounds, cbr2)){
        return YES;
    }
    CGPoint cbl2 = [view1 convertPoint:poly2[3] fromView:nil];
    if (CGRectContainsPoint(view1.bounds, cbl2)){
        return YES;
    }
    CGPoint ctl1 = [view2 convertPoint:poly1[0] fromView:nil];
    if (CGRectContainsPoint(view2.bounds, ctl1)){
        return YES;
    }
    CGPoint ctr1 = [view2 convertPoint:poly1[1] fromView:nil];
    if (CGRectContainsPoint(view2.bounds, ctr1)){
        return YES;
    }
    CGPoint cbr1 = [view2 convertPoint:poly1[2] fromView:nil];
    if (CGRectContainsPoint(view2.bounds, cbr1)){
        return YES;
    }
    CGPoint cbl1 = [view2 convertPoint:poly1[3] fromView:nil];
    if (CGRectContainsPoint(view2.bounds, cbl1)){
        return YES;
    }
    return NO;
}

-(int)getRandomNumberBetween:(int)from to:(int)to
{
    return (int)from + arc4random() % (to-from+1);
}

这看起来正确放置标签:

well transformed subviews

以及这个带有随机生成角度的短词示例(范围 270-360、0-90):

enter image description here

正如您所注意到的，没有文本显示在那里，标签看起来展开并且在这种情况下交叉检查器不起作用，如果从 viewDidLoad 或 viewDidApper 这个检查器调用的函数也是如此根本不工作，我真的需要帮助，有什么想法吗？ 谢谢!


Best Answer-推荐答案


调整大小问题是这样解决的:

- (void)placeItem:(UIView *)container :(UILabel *)word_l
{
    CGPoint initPoint = word_l.center;
    for (int i = 1; i <= 8; i++) {
        switch (i) {
            case 1:
                word_l.center = CGPointMake(word_l.center.x + viewPositionMovingStep, word_l.center.y);
                break;
            case 2:
                word_l.center = CGPointMake(word_l.center.x + viewPositionMovingStep, word_l.center.y + viewPositionMovingStep);
                break;
            case 3:
                word_l.center = CGPointMake(word_l.center.x, word_l.center.y + viewPositionMovingStep);
                break;
            case 4:
                word_l.center = CGPointMake(word_l.center.x - viewPositionMovingStep, word_l.center.y + viewPositionMovingStep);
                break;
            case 5:
                word_l.center = CGPointMake(word_l.center.x - viewPositionMovingStep, word_l.center.y);
                break;
            case 6:
                word_l.center = CGPointMake(word_l.center.x - viewPositionMovingStep,  - viewPositionMovingStep);
                break;
            case 7:
                word_l.center = CGPointMake(word_l.center.x, word_l.center.y - viewPositionMovingStep);
                break;
            case 8:
                word_l.center = CGPointMake(word_l.center.x + viewPositionMovingStep, word_l.center.y - viewPositionMovingStep);
                break;
            default:
                break;
        }
        if ([self viewIntersectsWithAnotherView:container chosenView:word_l]) {
            word_l.center = initPoint;
        } else {
            viewPositionMovingStep = 0;
            return;
        }
    }
}

原因是: 使用transform属性时，不能通过改变frame来改变位置，必须使用center属性。

所以这部分已修复，但留下了与旋转 View 交叉点相关的问题，检查器无法正常工作，但在其他项目中单独测试它做得很好。

他来了:

- (BOOL)view:(UIView *)view1 intersectsWith:(UIView *)view2
{
    CGPoint poly1[4];
    CGRect bounds1 = view1.bounds;
    poly1[0] = [view1 convertPoint:bounds1.origin toView:nil];
    poly1[1] = [view1 convertPoint:CGPointMake(bounds1.origin.x + bounds1.size.width, bounds1.origin.y) toView:nil];
    poly1[2] = [view1 convertPoint:CGPointMake(bounds1.origin.x + bounds1.size.width, bounds1.origin.y + bounds1.size.height) toView:nil];
    poly1[3] = [view1 convertPoint:CGPointMake(bounds1.origin.x, bounds1.origin.y + bounds1.size.height) toView:nil];

    CGPoint poly2[4];
    CGRect bounds2 = view2.bounds;
    poly2[0] = [view2 convertPoint:bounds2.origin toView:nil];
    poly2[1] = [view2 convertPoint:CGPointMake(bounds2.origin.x + bounds2.size.width, bounds2.origin.y) toView:nil];
    poly2[2] = [view2 convertPoint:CGPointMake(bounds2.origin.x + bounds2.size.width, bounds2.origin.y + bounds2.size.height) toView:nil];
    poly2[3] = [view2 convertPoint:CGPointMake(bounds2.origin.x, bounds2.origin.y + bounds2.size.height) toView:nil];

    CGPoint ctl2 = [view1 convertPoint:poly2[0] fromView:nil];
    if (CGRectContainsPoint(view1.bounds, ctl2)){
        return YES;
    }
    CGPoint ctr2 = [view1 convertPoint:poly2[1] fromView:nil];
    if (CGRectContainsPoint(view1.bounds, ctr2)){
        return YES;
    }
    CGPoint cbr2 = [view1 convertPoint:poly2[2] fromView:nil];
    if (CGRectContainsPoint(view1.bounds, cbr2)){
        return YES;
    }
    CGPoint cbl2 = [view1 convertPoint:poly2[3] fromView:nil];
    if (CGRectContainsPoint(view1.bounds, cbl2)){
        return YES;
    }
    CGPoint ctl1 = [view2 convertPoint:poly1[0] fromView:nil];
    if (CGRectContainsPoint(view2.bounds, ctl1)){
        return YES;
    }
    CGPoint ctr1 = [view2 convertPoint:poly1[1] fromView:nil];
    if (CGRectContainsPoint(view2.bounds, ctr1)){
        return YES;
    }
    CGPoint cbr1 = [view2 convertPoint:poly1[2] fromView:nil];
    if (CGRectContainsPoint(view2.bounds, cbr1)){
        return YES;
    }
    CGPoint cbl1 = [view2 convertPoint:poly1[3] fromView:nil];
    if (CGRectContainsPoint(view2.bounds, cbl1)){
        return YES;
    }
    return NO;
}

有人想法吗？

关于ios - 旋转后随机放置的 UILabel 大小错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/38989888/

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