CTLineBreakMode linebreakmode = kCTLineBreakByCharWrapping;
我已经尝试了自动换行选项（也是默认选项），但没有用。
我的问题是： 如何使我所绘制的文本正确换行，以便其作为输入文本的轮廓呈现？
// make your UITextView as a subclass of UITextView
// and override -drawRect: method in your UITextView subclass
- (void)drawRect:(CGRect)rect
{
self.textColor = [UIColor clearColor];
[self setTypingAttributes:[NSDictionary dictionaryWithObjectsAndKeys:self.font, NSFontAttributeName, _textBaseColor, NSForegroundColorAttributeName, nil ]]; // _textBaseColor is any color of your choice
CGRect newRect = CGRectMake(0, 0, CGRectGetWidth(self.frame), CGRectGetHeight(self.frame));
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetTextDrawingMode(context, kCGTextStroke);
// Make the thickness of the outline shadow. and increase the y position of shadow rect by 2.
CGContextSetLineWidth(context, (TEXTOUTLINE_PERCENT/100 * self.font.pointSize)+1); // TEXTOUTLINE_PERCENT can be 25.
CGContextSetLineJoin(context, kCGLineJoinRound);
CGContextSetLineCap(context, kCGLineCapButt);
CGContextSetStrokeColorWithColor(context, [UIColor clearColor].CGColor);
CGRect shadowrect = newRect;
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
{
shadowrect.origin.y += 0.5;
}
else
{
shadowrect.origin.y += 2;
}
[self.text drawInRect:shadowrect withAttributes:[NSDictionary dictionaryWithObjectsAndKeys:self.font, NSFontAttributeName, SHADOW_COLOR , NSForegroundColorAttributeName, nil]]; // SHADOW_COLOR can be [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.3]
// Make the thickness of the outline border of the text.
CGContextSetLineWidth(context, TEXTOUTLINE_PERCENT/100 * self.font.pointSize); // TEXTOUTLINE_PERCENT can be 25.
CGContextSetStrokeColorWithColor(context, [[UIColor clearColor] CGColor]);
[self.text drawInRect:newRect withAttributes:[NSDictionary dictionaryWithObjectsAndKeys:self.font, NSFontAttributeName, self.textOutlineColor , NSForegroundColorAttributeName, nil]];
// Draw filled text. This is the actual text.
CGContextSetTextDrawingMode(context, kCGTextFill);
CGContextSetFillColorWithColor(context, [[UIColor clearColor] CGColor]);
[self.text drawInRect:newRect withAttributes:[NSDictionary dictionaryWithObjectsAndKeys:self.font, NSFontAttributeName, _textBaseColor, NSForegroundColorAttributeName,_textBaseColor, NSStrokeColorAttributeName, nil]];
[super drawRect:rect];
}
只需要使用CSS创建一个字符串
NSString *htmlstring = [[NSString alloc] initWithFormat:@"<html><font style=\"text-shadow: 0 0 0.2em #F87, 0 0 0.2em #F87\">%@</font></html>", YourTextView.text, nil];
这将使TextView中的任何文本在网页上发光。如果您愿意，还可以给它一个黑色背景...使用此代码：
NSString *htmlstring = [[NSString alloc] initWithFormat:@"<html><body bgcolor=\"#000000\"><font style=\"text-shadow: 0 0 0.2em #F87, 0 0 0.2em #F87\">%@</font></body></html>", YourTextView.text, nil];
现在将其保存为html文件并加载到UIWebView中。或者通过javascript将其注入到URL中，然后将该URL加载到UIWebView中。
将UIWebView的框架和位置设置为与UITextView相匹配，以便它可以覆盖在其上，并显示带有黑色背景的红色发光文本。
@interface ViewController : UIViewController <uiwebviewdelegate></uiwebviewdelegate> {
IBOutlet UIWebView *webView;
//... other objects you already have can go here too..
}
.m:
self.webView.delegate = self;
NSString *htmlstring = [[NSString alloc] initWithFormat:@"<html><body style='background-color: transparent;'><textarea name='myTextArea'cols='20' rows='10' style='text-shadow: 0 0 0.2em #F87, 0 0 0.2em #F87; background-color:transparent; border:none'>You Can Edit This Text.</textarea></body></html>"];
[self.webView loadHTMLString:htmlstring baseURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] bundlePath]]];
self.webView.opaque = NO;
self.webView.backgroundColor = [UIColor clearColor];
编辑：这是“webView”属性和合成代码
@property(nonatomic,retain)IBOutlet UIWebView *nubrowser; //put in .h file at end of "@Interface" function after the closing curly bracket ("}")
@synthesize webView; //put in .m file directly after "@implementation" function