2
Je veux dessiner une chaîne attribuée à clipping rect, et j'ai trouvé une fonction écrite en Objective-C,Comment utiliser CFDictionaryCreate dans Swift 3?
CFDictionaryRef PINCHFrameAttributesCreateWithClippingRect(CGRect clippingRect, CGAffineTransform transform)
{
CGPathRef clipPath = CGPathCreateWithRect(clippingRect, &transform);
CFDictionaryRef options;
CFStringRef keys[] = {kCTFramePathClippingPathAttributeName};
CFTypeRef values[] = {clipPath};
CFDictionaryRef clippingPathDict = CFDictionaryCreate(NULL,
(const void **)&keys, (const void **)&values,
sizeof(keys)/sizeof(keys[0]),
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
CFTypeRef clippingArrayValues[] = { clippingPathDict };
CFArrayRef clippingPaths = CFArrayCreate(NULL, (const void **)clippingArrayValues, sizeof(clippingArrayValues)/sizeof(clippingArrayValues[0]), &kCFTypeArrayCallBacks);
CFStringRef optionsKeys[] = {kCTFrameClippingPathsAttributeName};
CFTypeRef optionsValues[] = {clippingPaths};
options = CFDictionaryCreate(NULL, (const void **)&optionsKeys, (const void **)&optionsValues,
sizeof(optionsKeys)/sizeof(optionsKeys[0]),
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
CFRelease(clippingPathDict);
CFRelease(clippingPaths);
CGPathRelease(clipPath);
return options;
}
Mais j'omettent de traduire dans Swift 3, quelqu'un peut me aider?
// J'ai essayé codes belowing, il compile et exécuté, mais le texte ne fait pas clip:
let keys: [CFString] = [kCTFrameClippingPathsAttributeName]
let values: [CFTypeRef] = [clipPath]
let keysPointer = UnsafeMutablePointer<UnsafeRawPointer?>.allocate(capacity: keys.count)
keysPointer.initialize(to: keys)
let valuesPointer = UnsafeMutablePointer<UnsafeRawPointer?>.allocate(capacity: values.count)
valuesPointer.initialize(to: values)
let options = CFDictionaryCreate(kCFAllocatorDefault, keysPointer, valuesPointer, 1, nil, nil)
let framesetter = CTFramesetterCreateWithAttributedString(attributedSring)
let frame = CTFramesetterCreateFrame(framesetter, CFRangeMake(0, attributedSring.length), rectPath.cgPath, options)
CTFrameDraw(frame, context)