pengyingh

摘要： 转自 ：http://lockriver.blog.163.com/blog/static/48723224201141045739670/Paths中的几个重要元素Pointsvoid CGContextMoveToPoint (CGContextRef c,CGFloat x,CGFloat y);指定一个点成为current pointQuartz会跟踪current point一般执行完一个相关函数后，current point都会相应的改变.Lines相关的几个函数void CGContextAddLineToPoint (CGContextRef c,CGFloat x,CGFlo 阅读全文

摘要： Internally, -drawInRect: will rotate the image into the correct orientation according to the imageOrientation property, then flip the image upside down to convert UIKit coordinates into CoreGraphics coordinates. Then it will call CGContextDrawImage. In this sense, -drawInRect: is surely slower.But u 阅读全文

摘要： http://justiseek.diandian.com/post/2012-01-31/147524601.UIGraphicsBeginImageContextWithOptions(pageView.page.bounds.size, YES, zoomScale);[pageView.page.layer renderInContext:UIGraphicsGetCurrentContext()];UIImage *uiImage = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();2.- 阅读全文

摘要： http://blog.sina.com.cn/s/blog_7ccde1bf0100ysi2.html以下Carbon代码可以将PDF页面CGPDFPageRef转换为Quartz的CGImageRef格式，这样就可以将PDF页面用在Core Animation中了。CGImageRefPDFPageToCGImage(size_tpageNumber,CGPDFDocumentRefdocument){CGPDFPageRefpage;CGRectpageSize;CGContextRefoutContext;CGImageRefThePDFImage;CGAffineTransformc 阅读全文

摘要： http://bbs.51cto.com/thread-842406-1-1.html#define HIRESDEVICE (((int)rintf([[[UIScreen mainScreen] currentMode] size].width/[[UIScreen mainScreen] bounds].size.width )>1))- (CGImageRef) blerg { CGFloat imageScale = (CGFloat)1.0; CGFloat width = (CGFloat)180.0; CGFloat height = (CGFloat)180.0; .. 阅读全文

摘要： To extend on the subject, ...without crashing? I load about 15 full size images from the photo library in UIImageViews and get out of memory warnings and eventually an app crash. These images range from around 250KB to 400KB. The UIImageViews are set to aspect fit.The photo library seems to load sma 阅读全文

摘要： http://bbs.weiphone.com/read-htm-tid-95491.html我的代码做了如下：NSString* sCands = [NSString stringWithUTF8String:"欢迎"];//struct __GSFont * font=[NSClassFromString(@"WebFontCache") createFontWithFamily:@"STHeiti" traits:2 size:18.];//struct __GSFont * font=GSFontCreateWithName( 阅读全文

摘要： I load a UIImageView with an image depending on user interaction. When the parent view is initially displayed, no image has been selected and the imageview is black. If the user leaves that view and comes back, the image is still there. I've triedmyImageView.image = nil;upon leaving the view but 阅读全文

摘要： http://stackoverflow.com/questions/3838725/what-is-the-difference-between-uiimageview-and-drawinrectI want to display so many images in table cells. I knew two methods to show an image.One is creating an instance to UIImageView and show itCGRect rect=CGRectMake(x,y,width,height);UIImageView*image=[[ 阅读全文

摘要： Hi, I'm trying to correct the camera's image orientation.I'm using this function lifted out of a book but it's returning an image.Can you see what's wrong?I'm using ios 5.- (UIImage *)fixOrientation: (UIImage *) image{ CGSize size = image.size; if (image.imageOrientation == U 阅读全文