有人可以解释为什么我在这里得到"潜在的物体泄漏"警告吗？我不明白.谢谢!
-(Code) drawTo:(ContextClass *) trg
{
CGColorSpaceRef rgbColorspace = CGColorSpaceCreateDeviceRGB();
CGFloat values[4] = { getRed(colour),
getGreen(colour),
getBlue(colour), 1.0 };
trg.storedColourRef = CGColorCreate(rgbColorspace, values);
CGColorSpaceRelease(rgbColorspace);
return OK;
}
是因为我将对象存储在trg.storedColourRef中吗？...这是不同类别的财产:
@property (nonatomic, assign) CGColorRef storedColourRef;
如何区分didReceiveMemoryWarning中的两个内存警告级别？
Received memory warning. Level=1
Received memory warning. Level=2
我想警告用户发生了什么,但仅限于2级(更关键).有谁知道如何编码？
谢谢!
我有一个加载了一个简单的 rtf 文件的 UIWebView。（包含一行“这是一个测试”）
UIWebView* webview = [[UIWebView alloc] initWithFrame:CGRectMake(5, 50, 310, 400)];
[[self view] addSubview:webview];
[webview loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"test" ofType:@"rtf"]isDirectory:NO]]];
NSString *html = [webview stringByEvaluatingJavaScriptFromString: @"all"];
NSLog (@"html:%@", html.debugDescription);
“THIS IS A TEXT”行正确显示在 UIWebView 中。有谁知道是否可以将那行文本（或更多）提取到 NSString 或其他一些可访问的容器中？
我知道有：
NSString *html = [webview stringByEvaluatingJavaScriptFromString: @"document.documentElement.outerHTML"];
但这（显然）在这里不起作用。有任何想法吗 ？我基本上是在尝试（假）将 rtf 文件转换为 iOS 上的 NSString。谢谢！
我有这种方法(别人写了!)
- (CGPDFDocumentRef)getPdf {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *pdfPath = [documentsDirectory stringByAppendingPathComponent:@"myLocalFileName.pdf"];
NSURL *pdfURL = [NSURL fileURLWithPath:pdfPath];
CGPDFDocumentRef pdf = CGPDFDocumentCreateWithURL((CFURLRef)pdfURL);
return pdf;
}
现在,我运行了Analyze并获得三个内存泄漏警告:
Call to function 'CGPDFDocumentCreateWithURL' returns a Core Foundation object with a +1 retain count
Object returned to caller as an owning reference (single retain count transferred to caller)
Object leaked: object allocated and stored into 'pdf' is returned from a method whose name ('getPdf') does not start …这里的菜鸟问题:
任何想法为什么这个代码:
UIViewController* popoverviewController = [[UIViewController alloc]init];
UIView* popoverView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
[webViewnetwork loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"webView" ofType:@"html"]isDirectory:NO]]];
[popoverView addSubview:webViewnetwork];
popoverviewController.view = popoverView;
popoverviewController.contentSizeForViewInPopover = CGSizeMake (100, 100);
self.popoverController = [[UIPopoverController alloc] initWithContentViewController:popoverviewController];
[self.popoverController presentPopoverFromRect:CGRectMake(0, 0, 1, 1) inView:self.view permittedArrowDirections:UIPopoverArrowDirectionUp animated:YES];
在iPad上工作正常,但在iPhone上崩溃？我正在尝试做与我的iPad版本相同的事情,即添加带有html格式文本的子视图.它在第7行(initWithContentViewController)崩溃(程序接收信号:SIGABRT)
谢谢!
我有一个html字符串,我从这次调用中收到了UIWebView:
NSString *html = [webview stringByEvaluatingJavaScriptFromString: @"document.documentElement.innerHTML"];
NSString的内容是:
<head>
<meta name="viewport" content="width=508">
<style type="text/css">
img {max-width:100%;}
div { margin-top: 0;margin-bottom: 0;font-family:Arial, sans-serif;}
p{margin-top: 0;margin-bottom: 0;word-wrap:break-word;}
table{border-collapse: collapse;}
td{word-wrap:break-word;font-family:Arial;vertical-align:top;}
</style>
<style type="text/css" media="screen">
.bumpedFont16 { font-size:1.6em; }
.bumpedFont20 { font-size:2.0em; }
</style>
</head>
<body>
<div style="width:508;background-color:#FFFFFF; position:relative; overflow:hidden;word-wrap:break-word;min-height:830px; padding-left:20;padding-right:20;padding-top:20;padding-bottom:20;">
<style type="text/css">
.s0 {font-size: 12;font-family: Helvetica;color: rgb(0,0,0);}
.s1 {direction:ltr;text-align: left;}
</style>
<p class="s1">
<span class="s0">
<span class="bumpedFont16">THIS IS A TEST</span>
</span>
</p>
</div>
</body>
如何将html字符串中的"这是一个测试"作为纯文本从另一个NSString中获取而没有任何格式？谢谢!