我想使用排除路径,因为在其他设备上,我可能会根据屏幕大小不同地定位图像.
但是,如果CGRect用于创建排除路径的Y原点为0,并占用textVIEw的全部宽度,则排除失败,文本将显示在排除路径中(以便文本显示在imageVIEw,你可以看到在那个截图).
要测试这个,我使用“单视图”Xcode模板构建了一个简单的应用程序,其中包含以下内容:
- (voID)vIEwDIDLoad { [super vIEwDIDLoad]; // set up the textVIEw CGRect frame = CGRectMake(0,self.vIEw.frame.size.wIDth,self.vIEw.frame.size.height); UITextVIEw *textVIEw = [[UITextVIEw alloc] initWithFrame:frame]; [textVIEw setFont:[UIFont systemFontOfSize:36.0]]; [self.vIEw addSubvIEw:textVIEw]; textVIEw.text = @"I wish this text appeared below the exclusion rect and not within it."; // add the photo CGfloat textVIEwWIDth = textVIEw.frame.size.wIDth; // uncomment if you want to see that the exclusion path DOES work when not taking up the full wIDth: // textVIEwWIDth = textVIEwWIDth / 2.0; CGfloat originY = 0.0; // uncomment if you want to see that the exclusion path DOES work if the Y origin isn't 0 // originY = 54.0; UIImageVIEw *imageVIEw = [[UIImageVIEw alloc] initWithImage:[UIImage imagenamed:@"photo_thumbnail"]]; imageVIEw.frame = CGRectMake(0,originY,textVIEwWIDth,textVIEwWIDth); imageVIEw.Alpha = 0.7; // just so you can see that the text is within the exclusion path (behind photo) [textVIEw addSubvIEw:imageVIEw]; // set the exclusion path (to the same rect as the imageVIEw) CGRect exclusionRect = [textVIEw convertRect:imageVIEw.bounds fromVIEw:imageVIEw]; UIBezIErPath *exclusionPath = [UIBezIErPath bezIErPathWithRect:exclusionRect]; textVIEw.textContainer.exclusionPaths = @[exclusionPath];}
我也尝试子类化NSTextContainer并覆盖-lineFragmentRectForProposedRect方法,但调整Y原点似乎也没有帮助.
要使用自定义NSTextContainer,我在vIEwDIDLoad()中设置了这样的UITextVIEw堆栈:
// set up the textVIEw stackNSTextStorage *textStorage = [[NSTextStorage alloc] init];NSLayoutManager *layoutManager = [[NSLayoutManager alloc] init];[textStorage addLayoutManager:layoutManager];CGSize containerSize = CGSizeMake(self.vIEw.frame.size.wIDth,CGfloat_MAX);CustomTextContainer *textContainer = [[CustomTextContainer alloc] initWithSize:containerSize];[layoutManager addTextContainer:textContainer];CGRect frame = CGRectMake(0,self.vIEw.frame.size.height);UITextVIEw *textVIEw = [[UITextVIEw alloc] initWithFrame:frame textContainer:textContainer];[textVIEw setFont:[UIFont systemFontOfSize:36.0]];[self.vIEw addSubvIEw:textVIEw];textVIEw.text = @"I wish this text appeared below the exclusion rect and not within it.";
然后我调整这个CustomTextContainer中的Y原点,但是这样也是如此壮观:
- (CGRect)lineFragmentRectForProposedRect:(CGRect)proposedRect atIndex:(NSUInteger)characterIndex writingDirection:(NSWritingDirection)baseWritingDirection remainingRect:(CGRect *)remainingRect { CGRect correctedRect = proposedRect; if (correctedRect.origin.y == 0) { correctedRect.origin.y += 414.0; } correctedRect = [super lineFragmentRectForProposedRect:correctedRect atIndex:characterIndex writingDirection:baseWritingDirection remainingRect:remainingRect]; NSLog(@"origin.y: %f | characterIndex: %lu",correctedRect.origin.y,(unsigned long)characterIndex); return correctedRect;}
我想这可以被认为是一个我需要报告的苹果错误(除非我缺少一些明显的东西),但是如果有人有解决办法,这将是非常感激的.
解决方法 快速解决方法:CGRect exclusionRect = [textVIEw convertRect:imageVIEw.bounds fromVIEw:imageVIEw];if (exclusionRect.origin.x <= 0 && exclusionRect.origin.y <= 0 && exclusionRect.size.wIDth >= textVIEw.bounds.size.wIDth) { exclusionRect.origin.x = 1; exclusionRect.origin.y = 1; exclusionRect.size.wIDth -= 2;}
您的图像仍然会保持相同,除非您使用的字体宽度为1像素(我甚至不确定可能会提供字距调整等),否则您的excludeRect将被保证小于整个宽度.
我有兴趣知道如果你允许你的直觉被实时地移动,你会看到什么样的结果.附上一个UIPanGestureRecognizer并更新你的排除对象,当你平移屏幕.文本在什么时候跳入图像?
编辑:如果您看到问题,直到它能够适应至少一个字符,或许尝试调整您的文本框架.
if (exclusionRect.origin.x <= 0 && exclusionRect.origin.y <= 0 && exclusionRect.size.wIDth >= textVIEw.bounds.size.wIDth) { frame.origin.y += CGRectGetMaxY(exclusionRect); frame.size.height -= CGRectGetMaxY(exclusionRect); [textVIEw setFrame:frame];}总结
以上是内存溢出为你收集整理的ios – 如果全局宽度位于textContainer的顶部,则UITextView textContainer排除路径将失败全部内容,希望文章能够帮你解决ios – 如果全局宽度位于textContainer的顶部,则UITextView textContainer排除路径将失败所遇到的程序开发问题。
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