//给UILabel设置行间距和字间距
-(void)setLabelSpace:(UILabel*)label withValue:(NSString*)str withFont:(UIFont*)font {
NSMutableParagraphStyle *paraStyle = [[NSMutableParagraphStyle alloc] init];
paraStyle.lineBreakMode = NSLineBreakByCharWrapping;
paraStyle.alignment = NSTextAlignmentLeft;
paraStyle.lineSpacing = UILABEL_LINE_SPACE; //设置行间距
paraStyle.hyphenationFactor = 1.0;
paraStyle.firstLineHeadIndent = 0.0;
paraStyle.paragraphSpacingBefore = 0.0;
paraStyle.headIndent = 0;
paraStyle.tailIndent = 0;
//设置字间距 NSKernAttributeName:@1.5f
NSDictionary *dic = @{NSFontAttributeName:font, NSParagraphStyleAttributeName:paraStyle, NSKernAttributeName:@1.5f
};
NSAttributedString *attributeStr = [[NSAttributedString alloc] initWithString:str attributes:dic];
label.attributedText = attributeStr;
}
//计算UILabel的高度(带有行间距的情况)
-(CGFloat)getSpaceLabelHeight:(NSString*)str withFont:(UIFont*)font withWidth:(CGFloat)width {
NSMutableParagraphStyle *paraStyle = [[NSMutableParagraphStyle alloc] init];
paraStyle.lineBreakMode = NSLineBreakByCharWrapping;
paraStyle.alignment = NSTextAlignmentLeft;
paraStyle.lineSpacing = UILABEL_LINE_SPACE;
paraStyle.hyphenationFactor = 1.0;
paraStyle.firstLineHeadIndent = 0.0;
paraStyle.paragraphSpacingBefore = 0.0;
paraStyle.headIndent = 0;
paraStyle.tailIndent = 0;
NSDictionary *dic = @{NSFontAttributeName:font, NSParagraphStyleAttributeName:paraStyle, NSKernAttributeName:@1.5f
};
CGSize size = [str boundingRectWithSize:CGSizeMake(width, HEIGHT) options:NSStringDrawingUsesLineFragmentOrigin attributes:dic context:nil].size;
return size.height;
}
1、NSAttributedString 不可变属性字符串,创建出来之后不能修改其属性(属性都是只读的),但是可以在创建的时候直接附加属性设置(属性是针对所有文本),其属性介绍以及用法,直接在代码上标注如下:
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 100, CGRectGetWidth(self.view.frame), 300)]; label.numberOfLines = 0;
[self.view addSubview:label];
label.backgroundColor = [UIColor lightGrayColor];
NSString *string = @"今日头条是一款基于数据挖掘的推荐引擎产品,它为用户推荐有价值的、个性化的信息,提供连接人与信息的新型服务,是国内移动互联网领域成长最快的产品服务之一。";
NSMutableDictionary *dict = [NSMutableDictionary dictionary];
dict[NSForegroundColorAttributeName] = [UIColor redColor]; // UIColor,文本前景颜色,默认是blackColor dict[NSBackgroundColorAttributeName] = [UIColor yellowColor];// UIColor,文本背景颜色(不是控件View的背景颜色),默认nil dict[NSFontAttributeName] = [UIFont systemFontOfSize:20];// UIFont,文本字体大小,默认 Helvetica(Neue) 12
/* 文本段落样式(详细段落样式见下方) // NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc]init]; // paragraphStyle.lineSpacing = 10; // 段落行距 */
dict[NSParagraphStyleAttributeName] = paragraphStyle; // NSParagraphStyle,文本段落样式
/*//删除线和下划线
枚举常量 NSUnderlineStyle中的值 NSUnderlineStyleNone //不设置删除线 NSUnderlineStyleSingle // 设置删除线为细单实线 NSUnderlineStyleThick // 设置删除线为粗单实线 NSUnderlineStyleDouble // 设置删除线为细双实线 NSUnderlinePatternSolid NSUnderlinePatternDot //点 NSUnderlinePatternDash //虚线 NSUnderlinePatternDashDot //虚线和点 NSUnderlinePatternDashDotDot //虚线和点点 NSUnderlineByWord
*/ dict[NSStrikethroughStyleAttributeName] = @(NSUnderlinePatternSolid | NSUnderlineStyleSingle); // NSNumber,加删除线,默认不加删除线,其它的话是加不同风格的删除线 dict[NSStrikethroughColorAttributeName] = [UIColor yellowColor]; // UIColor,删除线颜色,默认等于文本前景颜色,前提是需要加删除线,和NSStrikethroughStyleAttributeName有关 dict[NSUnderlineStyleAttributeName] = @(NSUnderlineStyleDouble); // NSNumber,加下划线,默认NSUnderlineStyleNone不加下划线,其它的话是加不同的下划线 dict[NSUnderlineColorAttributeName] = [UIColor yellowColor]; // UIColor,下划线颜色,默认等于文本前景颜色,前提是需要加下划线,和NSUnderlineStyleAttributeName有关
dict[NSStrokeColorAttributeName] = [UIColor yellowColor]; // UIColor,默认等于文本前景颜色,需要和NSStrokeWidthAttributeName一起使用 dict[NSStrokeWidthAttributeName] = @5; // NSNumber,使文本有一种中空的效果(有立体效果)数字越大,文本填充的越满,数字越小,文本颜色越淡,不需要和NSStrokeColorAttributeName一起使用 /* 文本阴影 NSShadow *shadow = [[NSShadow alloc] init]; shadow.shadowOffset = CGSizeMake(2, 3); 阴影偏移量 shadow.shadowColor = [UIColor yellowColor]; 阴影颜色 shadow.shadowBlurRadius = 1.0; 阴影圆角 */ dict[NSShadowAttributeName] = shadow; // NSShadow,默认没有阴影,
dict[NSKernAttributeName] = @10; // NSNumber,文本字间距(字与字之间的距离) dict[NSLinkAttributeName] = [NSURL URLWithString:@"http:baidu.com"]; // NSURL或者是链接字符串,文本链接样式,自带下划线,文本颜色是蓝色 dict[NSLinkAttributeName] = @"http:baidu.com"; // NSURL或者是链接字符串,文本链接样式,自带下划线,文本颜色是蓝色 dict[NSExpansionAttributeName] = @(-0.5); // NSNumber,本文的扩张倍数,负数的话相当于缩小 dict[NSObliquenessAttributeName] = @(0.7); // NSNumber,本文的斜体程度以及斜体方向,默认0不歪斜,负数相当于右斜,正数相当于左斜,歪斜的程度由数字的大小决定 dict[NSBaselineOffsetAttributeName] = @(15.0); // NSNumber,行文本基线的偏移量 dict[NSWritingDirectionAttributeName] = @[@(NSWritingDirectionOverride),@(NSWritingDirectionRightToLeft)]; // 貌似是文本写入方向 dict[NSVerticalGlyphFormAttributeName] = @(1); // 文本的垂直与水平,目前在[iOS](http://lib.csdn.net/base/ios),它总是水平,任何其他值的行为是未定义的 NSTextAttachment *textAtt = [[NSTextAttachment alloc] init]; textAtt.image = [UIImage imageNamed:@"cloud.png"]; dict[NSAttachmentAttributeName] = textAtt; // 在文本中插入表情 label.attributedText = [[NSAttributedString alloc] initWithString:string attributes:dict];
2、NSMutableAttributedString可变属性字符串,创建出来之后可修改其属性,也可以给文本在某一个范围内添加单个属性或者字典属性(一次性添加很多属性),比如一个属性字符串不同范围的颜色不一样,其属性介绍以及用法,直接在代码上标注如下:
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 100, CGRectGetWidth(self.view.frame), 300)]; label.numberOfLines = 0; [self.view addSubview:label]; label.backgroundColor = [UIColor lightGrayColor]; NSString *string = @"今日头条是一款基于数据挖掘的推荐引擎产品,它为用户推荐有价值的、个性化的信息,提供连接人与信息的新型服务,是国内移动互联网领域成长最快的产品服务之一。"; NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc]initWithString:string]; NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc]init]; [paragraphStyle setLineSpacing:10]; [attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, string.length)]; // [attributedString addAttributes:<#(nonnull NSDictionary *)#> range:<#(NSRange)#>]; // 添加字典属性 [attributedString addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(0, 10)]; label.attributedText = attributedString;
NSMutableParagraphStyle的部分属性:
typedef NS_ENUM(NSInteger, NSLineBreakMode) {/* What to do with long lines */
NSLineBreakByWordWrapping = 0, /* Wrap at word boundaries, default */
NSLineBreakByCharWrapping,/* Wrap at character boundaries */
NSLineBreakByClipping,/* Simply clip */剪掉后面显示不了的部分
NSLineBreakByTruncatingHead,/* Truncate at head of line: "...wxyz" */头部分的内容以……方式省略
NSLineBreakByTruncatingTail,/* Truncate at tail of line: "abcd..." */结尾部分的内容以……方式省略
NSLineBreakByTruncatingMiddle/* Truncate middle of line: "ab...yz" */中间部分的内容以……方式省略
} NS_ENUM_AVAILABLE_IOS(6_0);
typedef NS_ENUM(NSInteger, NSWritingDirection) {
NSWritingDirectionNatural = -1, // Determines direction using the Unicode Bidi Algorithm rules P2 and P3
NSWritingDirectionLeftToRight = 0, // Left to right writing direction 左到右的书写方向
NSWritingDirectionRightToLeft = 1 // Right to left writing direction 右到左的书写方向
} NS_ENUM_AVAILABLE_IOS(6_0);
// NSParagraphStyleAttributeName 段落的风格(设置首行,行间距,对齐方式什么的)看自己需要什么属性,写什么
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
paragraphStyle.lineSpacing = 10;// 字体的行间距
paragraphStyle.firstLineHeadIndent = 20.0f;//首行缩进
paragraphStyle.alignment = NSTextAlignmentJustified;//(两端对齐的)文本对齐方式:(左,中,右,两端对齐,自然)
paragraphStyle.lineBreakMode = NSLineBreakByTruncatingTail;//结尾部分的内容以……方式省略 ( "...wxyz" ,"abcd..." ,"ab...yz")
paragraphStyle.headIndent = 20;//整体缩进(首行除外)
paragraphStyle.tailIndent = 20;//
paragraphStyle.minimumLineHeight = 10;//最低行高
paragraphStyle.maximumLineHeight = 20;//最大行高
paragraphStyle.paragraphSpacing = 15;//段与段之间的间距
paragraphStyle.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. */
paragraphStyle.baseWritingDirection = NSWritingDirectionLeftToRight;//从左到右的书写方向(一共??三种)
paragraphStyle.lineHeightMultiple = 15;/* Natural line height is multiplied by this factor (if positive) before being constrained by minimum and maximum line height. */
paragraphStyle.hyphenationFactor = 1;//连字属性 在iOS,唯一支持的值分别为0和1
/*
NSFontAttributeName 字体大小
NSParagraphStyleAttributeName 段落的风格(设置首行,行间距,对齐方式什么的)
NSKernAttributeName 字间距
*/
NSDictionary *attributes = @{
NSFontAttributeName:[UIFont systemFontOfSize:15],
NSParagraphStyleAttributeName:paragraphStyle,
NSKernAttributeName:@(10),
};
textView.attributedText = [[NSAttributedString alloc] initWithString:textView.text attributes:attributes];
3、NSMutableParagraphStyle
用于设定文本段落有关设置,比如行间距,文本缩进,段间距等等,其用法如下:
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 100, CGRectGetWidth(self.view.frame), 300)];
label.numberOfLines = 0;
[self.view addSubview:label];
label.backgroundColor = [UIColor lightGrayColor];
NSString *string = @"今日头条是一款基于数据挖掘的推荐引擎产品,它为用户推荐有价值的、个性化的信息,提供连接人与信息的新型服务,是国内移动互联网领域成长最快的产品服务之一。";
/* 文本段落样式
// NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc]init];
// paragraphStyle.lineSpacing = 10; // 段落行距
// paragraphStyle.headIndent = 5; // 非首行文本缩进
// paragraphStyle.tailIndent = -20; // 文本缩进(右端)
// paragraphStyle.firstLineHeadIndent = 20; // 首行文本缩进
// paragraphStyle.alignment = NSTextAlignmentRight; // 文本对齐方式
// paragraphStyle.lineBreakMode = NSLineBreakByWordWrapping; // 折行方式
// paragraphStyle.baseWritingDirection = NSWritingDirectionLeftToRight; // 文本写入方式
// paragraphStyle.lineHeightMultiple = 3.0; // 文本行间距是默认行间距的多少倍
// paragraphStyle.maximumLineHeight = 50; // 文本最大行距
// paragraphStyle.minimumLineHeight = 50; // 文本最小行距
// paragraphStyle.allowsDefaultTighteningForTruncation = YES; // 目前还不知道有什么作用
// paragraphStyle.hyphenationFactor = 1.0; // 设置每行的最后单词是否截断,在0.0-1.0之间,默认为0.0,越接近1.0单词被截断的可能性越大,
// paragraphStyle.paragraphSpacing = 10; // 段落后面的间距
// paragraphStyle.paragraphSpacingBefore = 20; //设置段与段之间的距离
*/
// dict[NSParagraphStyleAttributeName] = paragraphStyle; // NSParagraphStyle,文本段落样式
label.attributedText = [[NSAttributedString alloc] initWithString:string attributes:dict];
属性字符串基本上就那么多内容,只不过需要在应用中灵活运用而已。