ios - iphone notes.app 像下划线
<p><p>我已经搜索了很多类似的问题,我决定在这里问这个问题,如果已经问过,我找不到它,抱歉。 </p>
<p>我发现:<a href="https://stackoverflow.com/questions/2615841/uitextview-like-iphone-notes-application" rel="noreferrer noopener nofollow">UITextView like iPhone Notes application</a>重定向到这里:<a href="http://www.cocoanetics.com/2010/03/stuff-you-learn-from-reverse-engineering-notes-app/" rel="noreferrer noopener nofollow">http://www.cocoanetics.com/2010/03/stuff-you-learn-from-reverse-engineering-notes-app/</a>但是在逆向工程中没有完整的代码示例!? </p>
<p>我正在为 iphone 创建一个应用程序,该应用程序存储并允许人们在 iphone 中输入他们的文本,如 notes.app。据我所知,我需要在文本下划线,我需要在 uitextview 中进行,这是 uiscrollview 的子类 .. </p>
<p>如果有人有任何建议,我会很高兴.. </p>
<p>谢谢..</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>当我需要使用 UILabel 执行此操作时,我创建了 UIView 的子类并自己实现了自定义绘图。它非常详细,但并不那么复杂。我最终传递了处理粗体(<b> 和</b>)和换行符(<br>)格式的类似HTML 的语法。我认为您可以使用 (< u > 和 </u >) 对下划线做同样的事情。 </p>
<p>基本上,我的技术是使用类似 HTML 的标记(首先在“br”标签上,然后在“b”标签上)拆分字符串,然后将每个子字符串拆分为“单词”,然后处理测量和单独绘制每个单词。如果一个单词不适合当前行,我会换行到下一行。它并不完美,它不能处理很多场景(例如,新的行标签不能放在粗体标签内),但它符合我的意图。 </p>
<p>不幸的是,我不知道为什么某些(大多数/全部?)iOS 基本文本显示控件没有更好地支持文本格式。 </p>
<hr/>
<p><em><strong>编辑/更新:</strong></em><br/>
我将继续添加我编写的 UIView 子类(UILabel 的替换)。使用风险自负! :-)</p>
<p><code>MMFormattedTextView.h</code></p>
<pre><code>#import <UIKit/UIKit.h><br>
@interface MMFormattedTextView : UIView {
int InsetLeft;
int InsetTop;
NSString *LabelText;
UIFont *LabelFont;
}
@property (assign, nonatomic) int InsetLeft;
@property (assign, nonatomic) int InsetTop;
@property (strong, nonatomic) NSString *LabelText;
@property (strong, nonatomic) UIFont *LabelFont;
- (NSInteger)numberOfLinesForRect:(CGRect)rect;
@end
</code></pre>
<p><code>MMFormattedTextView.m</code></p>
<pre><code>#import "MMFormattedTextView.h"
@implementation MMFormattedTextView
@synthesize InsetLeft;
@synthesize InsetTop;
@synthesize LabelFont;
@synthesize LabelText;
// LIMITATION: Each bolded section must reside IN BETWEEN <br> tags; it MAY NOT span <br> tags!!!!
- (void)drawRect:(CGRect)rect {
CGContextRef ctx = UIGraphicsGetCurrentContext();
CGContextClearRect(ctx, rect);
// Sets up the first position, which is 1 line "off the top",
// adjusted so that the text will be centered when it's all drawn
CGFloat howManyLinesWouldFit = rect.size.height / [ lineHeight];
NSInteger howManyLinesDoWeHave = ;
CGFloat lineOffset = (howManyLinesWouldFit - howManyLinesDoWeHave) / 2.0;
CGPoint topLeft = CGPointMake(, - [ lineHeight] + (lineOffset * [ lineHeight]));
// Split the text into hard-split lines (actual <br> tags in the text)
NSArray *lines = [ componentsSeparatedByString:@"<br>"];
// Iterate through each hard-coded line
for (NSString *line in lines) {
// Iterate to the next line
topLeft = CGPointMake(, topLeft.y + [ lineHeight]);
NSArray *pieces = ;
BOOL bold = YES;
for (NSString *piece in pieces) {
bold = !bold;
UIFont *fontToUse;
if (bold) {
fontToUse = pointSize]];
} else {
fontToUse = pointSize]];
}
NSArray *words = ;
for (NSString *word in words) {
if () continue;
NSString *wordWithSpace = ;
CGSize wordSize = ;
if ((topLeft.x + wordSize.width) > (rect.size.width - )) {
// This runs off this line, so go to the next line
topLeft = CGPointMake(, topLeft.y + [ lineHeight]);
}
;
topLeft = CGPointMake(topLeft.x + wordSize.width, topLeft.y);
}
}
}
}
- (NSInteger)numberOfLinesForRect:(CGRect)rect {
int retVal = 0;
int left = ;
NSArray *lines = [ componentsSeparatedByString:@"<br>"];
// Iterate through each hard-coded line
for (NSString *line in lines) {
// Iterate to the next line
retVal = retVal + 1;
left = ;
NSArray *pieces = ;
BOOL bold = YES;
for (NSString *piece in pieces) {
bold = !bold;
UIFont *fontToUse;
if (bold) {
fontToUse = pointSize]];
} else {
fontToUse = pointSize]];
}
NSArray *words = ;
for (NSString *word in words) {
if () continue;
NSString *wordWithSpace = ;
CGSize wordSize = ;
if ((left + wordSize.width) > (rect.size.width - )) {
// This runs off this line, so go to the next line
retVal = retVal + 1;
left = ;
}
left = left + wordSize.width;
}
}
}
return retVal;
}
@end
</code></pre></p>
<p style="font-size: 20px;">关于ios - iphone notes.app 像下划线,我们在Stack Overflow上找到一个类似的问题:
<a href="https://stackoverflow.com/questions/10375592/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/10375592/
</a>
</p>
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