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我刚刚使用堆栈创建了一个自定义方法,但对大小和帧大小TextKit之间的差异感到困惑。文本有一个白色边框,我想知道如何摆脱它(见更新)。最后一个字符之后的区域也是白色的。我已经设置了一个属性来使用与字符串长度匹配的范围,但到目前为止我还没有找到一种方法将此属性应用于整个区域。NSTextContainerNSTextViewbackgroundColor

我尝试了各种设置组合NSTextContainerUITextView. 以下语句最接近所需结果,但白色边框仍然存在。

    // A
    textContainer = [[NSTextContainer alloc] initWithSize:textFrame.size];

    // D 
    UITextView *textView = [[UITextView alloc] initWithFrame: textFrame textContainer: textContainer];

在此处输入图像描述

我在这里这里完成了教程,并在这里TextKit 这里搜索了 Apple 文档。我还检查了最接近的问题,是的,我有 appDelegate

    [self.window makeKeyAndVisible];

更新

此处的答案已消除白色边框(感谢Larme

在此处输入图像描述

textView在方法的末尾添加了以下语句

    textView.textContainerInset = UIEdgeInsetsZero;
    textView.textContainer.lineFragmentPadding = 0;

如果相关,该应用程序是在 iOS 4 中启动的。它现在使用 Xcode 版本 9.2 运行 iOS 11。它已经使用textView并且TextKit现在正在考虑(不情愿地)作为解决来自应用程序测试人员的许多请求的一种方式。因此,任何可能有助于解释和解决此问题的指针都将受到欢迎。

感谢期待。

这是该方法的代码。helpMessage从数组中读取(未显示)。

    -(id)formatHelpText:(NSString*)helpMessage
{
    float sideMargin   = 5;
    float topMargin    = 72;

    CGFloat textWidth  = [UIScreen mainScreen].bounds.size.width - (sideMargin * 2);
    CGFloat textHeight = [UIScreen mainScreen].bounds.size.height - (topMargin * 2);
    CGRect  textFrame  = CGRectMake(sideMargin, topMargin, textWidth, textHeight); // used for A & D


    NSMutableAttributedString *attributedText = [[NSMutableAttributedString alloc] initWithString:helpMessage];

// define paragraph attributes

    NSMutableParagraphStyle *style = [[NSMutableParagraphStyle alloc] init];
    [style setLineSpacing:1.5];
    [style setAlignment:NSTextAlignmentLeft];

// use attributedText to define character attributes

    float spacing        = 0.0f;
    float baselineOffSet = 1.0f;

    [attributedText setAttributes:@{
                                NSFontAttributeName:[UIFont preferredFontForTextStyle:UIFontTextStyleBody],
                                NSBaselineOffsetAttributeName:[NSNumber numberWithFloat:baselineOffSet],
                                NSForegroundColorAttributeName:[UIColor whiteColor],
                                NSBackgroundColorAttributeName:[UIColor grayColor],
                                NSParagraphStyleAttributeName:style,
                                NSKernAttributeName:@(spacing)
                                }
                        range:range];


// TextKit - non-view

    NSTextStorage *textStorage;
    NSLayoutManager *layoutManager;
    NSTextContainer *textContainer;

    textStorage   = [[NSTextStorage alloc] initWithAttributedString:attributedText];
    layoutManager = [[NSLayoutManager alloc] init];
    textContainer = [[NSTextContainer alloc] init];

    [textStorage addLayoutManager:layoutManager];


// A
    textContainer = [[NSTextContainer alloc] initWithSize:textFrame.size];
// B 
//    textContainer = [[NSTextContainer alloc] initWithSize:[UIScreen mainScreen].bounds.size];   
    [layoutManager addTextContainer:textContainer];


// C
//    UITextView *textView = [[UITextView alloc] initWithFrame: [UIScreen mainScreen].bounds textContainer: textContainer];
// D 
    UITextView *textView = [[UITextView alloc] initWithFrame: textFrame textContainer: textContainer];


// update

    textView.textContainerInset = UIEdgeInsetsZero;
    textView.textContainer.lineFragmentPadding = 0;

    return textView;
}
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1 回答 1

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现在这两个问题都解决了。删除了白色边框UIEdgeInsetsZero以清除默认设置和textContainer.lineFragmentPadding = 0谢谢,Larme)。UITextView我通过删除背景颜色作为字符属性并将其定义为添加的属性来隐藏最后一行未突出显示的部分,textView. sizeToFit以最大限度地减少textView. 这是最终代码

#import "HelpTextView.h"

@implementation HelpTextView

-(id)formatHelpText:(NSString*)helpMessage
{
    float sideMargin   = 5;
    float topMargin    = 72;

    CGFloat textWidth  = [UIScreen mainScreen].bounds.size.width - (sideMargin * 2);
    CGFloat textHeight = [UIScreen mainScreen].bounds.size.height - (topMargin * 2);
    CGRect  textFrame  = CGRectMake(sideMargin, topMargin, textWidth, textHeight);

    NSMutableAttributedString *attributedText = [[NSMutableAttributedString alloc] initWithString:helpMessage];

    // define paragraph attributes

    NSMutableParagraphStyle *style = [[NSMutableParagraphStyle alloc] init];
    [style setLineSpacing:0.5];
    [style setAlignment:NSTextAlignmentLeft];

    float spacing = 0.0f;
    float baselineOffSet = 1.0f;
    NSRange range = (NSRange){0,[attributedText length]};

    // use attributedText to define character attributes

    [attributedText setAttributes:@{
                                NSFontAttributeName:[UIFont preferredFontForTextStyle:UIFontTextStyleBody],
                                NSBaselineOffsetAttributeName:[NSNumber numberWithFloat:baselineOffSet],
                                NSForegroundColorAttributeName:[UIColor whiteColor],
                                NSParagraphStyleAttributeName:style,
                                NSKernAttributeName:@(spacing)
                                }
                        range:range];

    NSTextStorage* textStorage = [[NSTextStorage alloc] initWithAttributedString:attributedText];
    NSLayoutManager *layoutManager = [NSLayoutManager new];
    [textStorage addLayoutManager:layoutManager];

    CGSize containerSize = CGSizeMake(textFrame.size.width, CGFLOAT_MAX);
    NSTextContainer *textContainer = [[NSTextContainer alloc] initWithSize:containerSize];

    [layoutManager addTextContainer:textContainer];

    UITextView *textView = [[UITextView alloc] initWithFrame: textFrame textContainer: textContainer];
    textView.textContainerInset = UIEdgeInsetsZero;
    textView.textContainer.lineFragmentPadding = 0;
    textView.editable = NO;
    textView.scrollEnabled = NO;
    textView.backgroundColor = [UIColor grayColor];
    [textView sizeToFit];

    return textView;
}
于 2018-02-11T07:08:46.507 回答