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| #import "ZJTextImageV.h"
#import<CoreText/CoreText.h>
@interface ZJTextImageV ()
@end
@implementation ZJTextImageV
- (instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
self.backgroundColor = [UIColor orangeColor];
}
return self;
}
- (void)drawRect:(CGRect)rect{
[super drawRect:rect];
// 初始化一个富文本对象
NSMutableAttributedString * attributeStr = [[NSMutableAttributedString alloc] initWithString:@"这里在测试图文混排，\n我是一个富文本"];
// 添加文本属性
[attributeStr addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:25] range:NSMakeRange(4, 2)];
// 插入图片
// 创建一个回调结构体，设值相关参数
CTRunDelegateCallbacks callBacks;
// memset将开辟内存空间初始化
memset(&callBacks, 0, sizeof(CTRunDelegateCallbacks));
// 设置回调版本
callBacks.version = kCTRunDelegateVersion1;
// 设置图片顶部距离基线的距离
callBacks.getAscent = ascentCallBacks;
// 设置图片底部距离基线的距离
callBacks.getDescent = descentCallBacks;
// 设置图片的宽度
callBacks.getWidth = widthCallBacks;
// 创建一个代理
NSDictionary * dicPic = @{@"height":@50,@"width":@100};
CTRunDelegateRef delegate = CTRunDelegateCreate(&callBacks,(__bridge void *)dicPic);
// 占位符
unichar placeHolder = 0xFFFC;
NSString * placeHolderStr = [NSString stringWithCharacters:&placeHolder length:1];
// 占位富文本
NSMutableAttributedString * placeHolderAttriStr = [[NSMutableAttributedString alloc] initWithString:placeHolderStr];
// 给占位字符串设置代理
CFAttributedStringSetAttribute((CFMutableAttributedStringRef)placeHolderAttriStr, CFRangeMake(0, 1), kCTRunDelegateAttributeName, delegate);
CFRelease(delegate);
// 插入占位字符
[attributeStr insertAttributedString:placeHolderAttriStr atIndex:15];
// 设置行间距
CGFloat lineSpacing = 30;
const CFIndex num = 1;
CTParagraphStyleSetting settings[num] = {{kCTParagraphStyleSpecifierLineSpacingAdjustment, sizeof(CGFloat), &lineSpacing}};//数组
CTParagraphStyleRef paragraphRef = CTParagraphStyleCreate(settings, num);
[attributeStr addAttribute:NSParagraphStyleAttributeName value:(__bridge id)(paragraphRef) range:NSMakeRange(0, attributeStr.length)];
// 释放
CFRelease(paragraphRef);
// 绘制文本
// 一个frame工厂，负责生产frame
CTFramesetterRef frameSetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)attributeStr);
// 创建绘制区域
CGMutablePathRef path = CGPathCreateMutable();
// 添加绘制尺寸
CGPathAddRect(path, NULL, self.bounds);
// 富文本长度
NSInteger length = attributeStr.length;
// 工厂根据绘制区域及富文本（可选范围，多次设置）设置frame
CTFrameRef frame = CTFramesetterCreateFrame(frameSetter, CFRangeMake(0, length), path, NULL);
// 获取当前绘制上下文
CGContextRef context = UIGraphicsGetCurrentContext();
// 设值字形的变换矩阵为不做变换
CGContextSetTextMatrix(context, CGAffineTransformIdentity);
// 平移方法，将画布向上平移一个视图高度
CGContextTranslateCTM(context, 0, self.bounds.size.height);
// 缩放方法，x轴缩放系数为1，则不变，y轴缩放系数为-1，则相当于以x轴为轴旋转180度
CGContextScaleCTM(context, 1, -1);
// 整个区域绘制
CTFrameDraw(frame, context);
// 绘制图片
UIImage * image = [UIImage imageNamed:@"icon"];
CGRect imgR = [self calculateImageRectWithFrame:frame];
CGContextDrawImage(context,imgR, image.CGImage);
// 释放
CFRelease(frameSetter);
CFRelease(path);
CFRelease(frame);
}
static CGFloat ascentCallBacks(void * ref)
{
return [(NSNumber *)[(__bridge NSDictionary *)ref valueForKey:@"height"] floatValue];
}
static CGFloat descentCallBacks(void * ref)
{
return 0;
}
static CGFloat widthCallBacks(void * ref)
{
return [(NSNumber *)[(__bridge NSDictionary *)ref valueForKey:@"width"] floatValue];
}
-(CGRect)calculateImageRectWithFrame:(CTFrameRef)frame
{
// 根据frame获取需要绘制的线的数组
NSArray * arrLines = (NSArray *)CTFrameGetLines(frame);
// 获取线的数量
NSInteger count = [arrLines count];
// 建立点的数组
CGPoint points[count];
// 获取起点
CTFrameGetLineOrigins(frame, CFRangeMake(0, 0), points);
// 遍历线的数组
for (int i = 0; i < count; i ++) {
// 获取线对象
CTLineRef line = (__bridge CTLineRef)arrLines[i];
// 获取run数组
NSArray * arrGlyphRun = (NSArray *)CTLineGetGlyphRuns(line);
// 遍历run数组
for (int j = 0; j < arrGlyphRun.count; j ++) {
// 获取run对象
CTRunRef run = (__bridge CTRunRef)arrGlyphRun[j];
// 获取run属性
NSDictionary * attributes = (NSDictionary *)CTRunGetAttributes(run);
// 获取代理
CTRunDelegateRef delegate = (__bridge CTRunDelegateRef)[attributes valueForKey:(id)kCTRunDelegateAttributeName];
if (delegate == nil) { // 非空
continue;
}
// 判断代理字典
NSDictionary * dic = CTRunDelegateGetRefCon(delegate);
if (![dic isKindOfClass:[NSDictionary class]]) { // 非空
continue;
}
CGPoint point = points[i]; // 获取一个起点
CGFloat ascent; // 上距
CGFloat descent; // 下距
CGRect boundsRun; // frame
// 获取宽
boundsRun.size.width = CTRunGetTypographicBounds(run, CFRangeMake(0, 0), &ascent, &descent, NULL);
// 获取高
boundsRun.size.height = ascent + descent;
// 获取x偏移量
CGFloat xOffset = CTLineGetOffsetForStringIndex(line, CTRunGetStringRange(run).location, NULL);
// point是行起点位置，加上每个字的偏移量得到每个字的x
boundsRun.origin.x = point.x + xOffset;
// 计算原点
boundsRun.origin.y = point.y - descent;
// 获取绘制区域
CGPathRef path = CTFrameGetPath(frame);
// 获取剪裁区域边框
CGRect colRect = CGPathGetBoundingBox(path);
CGRect imageBounds = CGRectOffset(boundsRun, colRect.origin.x, colRect.origin.y);
return imageBounds;
}
}
return CGRectZero;
}
|
