在iOS开发中,常常会有一段文字显示不同的颜色和字体,或者给某几个文字加删除线或下划线的需求。NSMuttableAttstring(带属性的字符串),可以灵活实现以上功能。
NSMutableParagraphStyle段落风格,设置行间距、段间距、缩进、对齐方式等。
- (id)initWithString:(NSString *)str;
//例:
NSMutableAttributedString *AttributedStr = [[NSMutableAttributedStringalloc]initWithString:@"文字样式处理"];
- (id)initWithString:(NSString *)str attributes:(NSDictionary *)attrs;
//如:
NSDictionary *attributeDict = [NSDictionarydictionaryWithObjectsAndKeys:
[UIFontsystemFontOfSize:15.0],NSFontAttributeName,
[UIColorredColor],NSForegroundColorAttributeName,
NSUnderlineStyleAttributeName,NSUnderlineStyleSingle,nil];
NSMutableAttributedString *AttributedStr = [[NSMutableAttributedStringalloc]initWithString:@"文字样式处理" attributes:attributeDict];
- (id)initWithAttributedString:(NSAttributedString *)attester;
- (void)setAttributes:(NSDictionary *)attrs range:(NSRange)range;
- (void)addAttribute:(NSString *)name value:(id)value range:(NSRange)range;
- (void)addAttributes:(NSDictionary *)attrs range:(NSRange)range;
- (void)removeAttribute:(NSString *)name range:(NSRange)range;
NSFontAttributeName //字体
NSParagraphStyleAttributeName //段落格式
NSForegroundColorAttributeName //字体颜色
NSBackgroundColorAttributeName //背景颜色
NSStrikethroughStyleAttributeName //删除线格式
NSUnderlineStyleAttributeName //下划线格式
NSStrokeColorAttributeName //删除线颜色
NSStrokeWidthAttributeName //删除线宽度
NSShadowAttributeName //阴影
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
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);
/*
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];
//随便定义一个字符串,做测试使用
NSString *massageStr = @"\t北京乌托邦有限公司(以下简称“乌托邦”)在此特别提醒您(用户)在注册成为用户之前,请认真阅读本《用户协议》(以下简称“协议”),确保您充分理解本协议中各条款。请您审慎阅读并选择接受或不接受本协议。除非您接受本协议所有条款,否则您无权注册、登录或使用本协议所涉服务。您的注册、登录、使用等行为将视为对本协议的接受,并同意接受本协议各项条款的约束。\r\n \t本协议约定乌托邦与用户之间关于“乌托邦”软件服务(以下简称“服务”)的权利义务。“用户”是指注册、登录、使用本服务的个人。本协议可由乌托邦随时更新,更新后的协议条款一旦公布即代替原来的协议条款,恕不再另行通知,用户可在本网站查阅最新版协议条款。在乌托邦修改协议条款后,如果用户不接受修改后的条款,请立即停止使用乌托邦提供的服务,用户继续使用乌托邦提供的服务将被视为接受修改后的协议。";
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:massageStr];
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
[paragraphStyle setLineSpacing:20];//调整行间距
[attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [self.agreementText length])];
[attributedString addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(0, 12)]; // 0为起始位置 length是从起始位置开始 设置指定颜色的长度
[attributedString addAttribute:NSForegroundColorAttributeName value:[UIColor blueColor] range:NSMakeRange(18, 3)];
//设置尺寸
[attributedString addAttribute:NSFontAttributeName value:[UIFont boldSystemFontOfSize:20] range:NSMakeRange(18, 3)]; // 0为起始位置 length是从起始位置开始 设置指定字体尺寸的长度
+ (CGFloat)getHeightWithContent:(NSString *)content width:(CGFloat)width font:(CGFloat)font{
CGRect rect = [content boundingRectWithSize:CGSizeMake(width, 999)
options:NSStringDrawingUsesLineFragmentOrigin
attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:font]}
context:nil];
return rect.size.height;
}
+ (CGFloat)getWidthWithContent:(NSString *)content height:(CGFloat)height font:(CGFloat)font{
CGRect rect = [content boundingRectWithSize:CGSizeMake(999, height)
options:NSStringDrawingUsesLineFragmentOrigin
attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:font]}
context:nil];
return rect.size.width;
}
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