实现对字符串的画线动画
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//// ZYAnimationLayer.m// ZYDrawString//// Created by soufun on 15-1-9.// Copyright (c) 2015年 ZY. All rights reserved.//#import "ZYAnimationLayer.h"@interface ZYAnimationLayer()@property (nonatomic, retain) CAShapeLayer *pathLayer;@property (nonatomic, retain) CALayer *penLayer;@end@implementation ZYAnimationLayer+(void)createAnimationLayerWithString:(NSString*)string andRect:(CGRect)rect andView:(UIView *)view andFont:(UIFont*)ui_font andStrokeColor:(UIColor*)color{ ZYAnimationLayer * animationLayer = [ZYAnimationLayer layer]; animationLayer.frame = rect; [view.layer addSublayer:animationLayer]; if (animationLayer.pathLayer != nil) { [animationLayer.penLayer removeFromSuperlayer]; [animationLayer.pathLayer removeFromSuperlayer]; animationLayer.pathLayer = nil; animationLayer.penLayer = nil; } CTFontRef font =CTFontCreateWithName((CFStringRef)ui_font.fontName, ui_font.pointSize, NULL); CGMutablePathRef letters = CGPathCreateMutable(); //这里设置画线的字体和大小 NSDictionary *attrs = [NSDictionary dictionaryWithObjectsAndKeys: (__bridge id)font, kCTFontAttributeName, nil]; NSAttributedString *attrString = [[NSAttributedString alloc] initWithString:string attributes:attrs]; CTLineRef line = CTLineCreateWithAttributedString((CFAttributedStringRef)attrString); CFArrayRef runArray = CTLineGetGlyphRuns(line); // for each RUN for (CFIndex runIndex = 0; runIndex < CFArrayGetCount(runArray); runIndex++) { // Get FONT for this run CTRunRef run = (CTRunRef)CFArrayGetValueAtIndex(runArray, runIndex); CTFontRef runFont = CFDictionaryGetValue(CTRunGetAttributes(run), kCTFontAttributeName); // for each GLYPH in run for (CFIndex runGlyphIndex = 0; runGlyphIndex < CTRunGetGlyphCount(run); runGlyphIndex++) { CFRange thisGlyphRange = CFRangeMake(runGlyphIndex, 1); CGGlyph glyph; CGPoint position; CTRunGetGlyphs(run, thisGlyphRange, &glyph); CTRunGetPositions(run, thisGlyphRange, &position); { CGPathRef letter = CTFontCreatePathForGlyph(runFont, glyph, NULL); CGAffineTransform t = CGAffineTransformMakeTranslation(position.x, position.y); CGPathAddPath(letters, &t, letter); CGPathRelease(letter); } } } CFRelease(line); UIBezierPath *path = [UIBezierPath bezierPath]; [path moveToPoint:CGPointZero]; [path appendPath:[UIBezierPath bezierPathWithCGPath:letters]]; CGPathRelease(letters); CFRelease(font); CAShapeLayer *pathLayer = [CAShapeLayer layer]; pathLayer.frame = animationLayer.bounds; pathLayer.bounds = CGPathGetBoundingBox(path.CGPath); pathLayer.geometryFlipped = YES; pathLayer.path = path.CGPath; pathLayer.strokeColor = [color CGColor]; pathLayer.fillColor = nil; pathLayer.lineWidth = 1.0f; pathLayer.lineJoin = kCALineJoinBevel; [animationLayer addSublayer:pathLayer]; animationLayer.pathLayer = pathLayer; UIImage *penImage = [UIImage imageNamed:@"noun_project_347_2.png"]; CALayer *penLayer = [CALayer layer]; penLayer.contents = (id)penImage.CGImage; penLayer.anchorPoint = CGPointZero; penLayer.frame = CGRectMake(0.0f, 0.0f, penImage.size.width, penImage.size.height); [pathLayer addSublayer:penLayer]; animationLayer.penLayer = penLayer; [animationLayer.pathLayer removeAllAnimations]; [animationLayer.penLayer removeAllAnimations]; animationLayer.penLayer.hidden = NO; CABasicAnimation *pathAnimation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"]; pathAnimation.duration = 5.0; pathAnimation.fromValue = [NSNumber numberWithFloat:0.0f]; pathAnimation.toValue = [NSNumber numberWithFloat:1.0f]; [animationLayer.pathLayer addAnimation:pathAnimation forKey:@"strokeEnd"]; CAKeyframeAnimation *penAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"]; penAnimation.duration = 5.0; penAnimation.path = animationLayer.pathLayer.path; penAnimation.calculationMode = kCAAnimationPaced; penAnimation.delegate = animationLayer; [animationLayer.penLayer addAnimation:penAnimation forKey:@"position"];}- (void) animationDidStop:(CAAnimation *)anim finished:(BOOL)flag{ self.penLayer.hidden = YES;}@end
摘自:
<a target=_blank href="https://github.com/bjzhangyang/ZYDrawString" target="_blank" id="url_1" style="font-stretch: normal; font-family: 宋体, 'Lucida Grande', Geneva, Arial, Verdana, Tahoma, Arial, 微软雅黑, 黑体; text-decoration: none; color: rgb(34, 153, 234);">https://github.com/bjzhangyang/ZYDrawString</a>
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