IOS 中CATextLayer绘制文本字符串

// 绘制文本的图层 CATextLayer *layerText = [[CATextLayer alloc] init]; // 背景颜色 layerText.backgroundColor = [UIColor orangeColor].CGColor; // 渲染分辨率-重要，否则显示模糊 layerText.contentsScale = [UIScreen mainScreen].scale; // 显示位置 layerText.bounds = CGRectMake(0.0, 0.0, 100.0, 50.0); layerText.position = position; // 添加到父图书 [self.view.layer addSublayer:layerText]; 

// 分行显示 layerText.wrapped = YES; // 超长显示时，省略号位置 layerText.truncationMode = kCATruncationNone; // 字体颜色 layerText.foregroundColor = [UIColor purpleColor].CGColor; // 字体名称、大小 UIFont *font = [UIFont systemFontOfSize:15.0]; CFStringRef fontName = (__bridge CFStringRef)font.fontName; CGFontRef fontRef =CGFontCreateWithFontName(fontName); layerText.font = fontRef; layerText.fontSize = font.pointSize; CGFontRelease(fontRef); // 字体对方方式 layerText.alignmentMode = kCAAlignmentJustified; 

// 字符显示 NSString *text = @"devZhang is iOSDeveloper.devZhang is iOSDeveloper.devZhang is iOSDeveloper.devZhang is iOSDeveloper."; 

// 方法1-简单显示 layerText.string = text; 

// 方法2-富文本显示 // 文本段落样式 NSMutableParagraphStyle *textStyle = [[NSMutableParagraphStyle alloc] init]; textStyle.lineBreakMode = NSLineBreakByWordWrapping; // 结尾部分的内容以……方式省略 ( "...wxyz" ,"abcd..." ,"ab...yz") textStyle.alignment = NSTextAlignmentCenter; //（两端对齐的）文本对齐方式：（左，中，右，两端对齐，自然） textStyle.lineSpacing = 5; // 字体的行间距 textStyle.firstLineHeadIndent = 5.0; // 首行缩进 textStyle.headIndent = 0.0; // 整体缩进(首行除外) textStyle.tailIndent = 0.0; // textStyle.minimumLineHeight = 20.0; // 最低行高 textStyle.maximumLineHeight = 20.0; // 最大行高 textStyle.paragraphSpacing = 15; // 段与段之间的间距 textStyle.paragraphSpacingBefore = 22.0f; // 段首行空白空间/* Distance between the bottom of the previous paragraph (or the end of its paragraphSpacing, if any) and the top of this paragraph. */ textStyle.baseWritingDirection = NSWritingDirectionLeftToRight; // 从左到右的书写方向（一共➡️三种） textStyle.lineHeightMultiple = 15; /* Natural line height is multiplied by this factor (if positive) before being constrained by minimum and maximum line height. */ textStyle.hyphenationFactor = 1; //连字属性 在iOS，唯一支持的值分别为0和1 // 文本属性 NSMutableDictionary *textAttributes = [[NSMutableDictionary alloc] init]; // NSParagraphStyleAttributeName 段落样式 [textAttributes setValue:textStyle forKey:NSParagraphStyleAttributeName]; // NSFontAttributeName 字体名称和大小 [textAttributes setValue:[UIFont systemFontOfSize:12.0] forKey:NSFontAttributeName]; // NSForegroundColorAttributeNam 颜色 [textAttributes setValue:[UIColor greenColor] forKey:NSForegroundColorAttributeName]; NSMutableAttributedString *attributedText = [[NSMutableAttributedString alloc] initWithString:text]; [attributedText setAttributes:textAttributes range:NSMakeRange(0, 8)]; layerText.string = attributedText;