iOS 文字樣式處理總結(jié)(字體臂痕、前背景色、斜體宛琅、加粗刻蟹、對(duì)齊、行間距嘿辟、段間距舆瘪、動(dòng)態(tài)獲取字符串label寬高等)
在iOS開(kāi)發(fā)中,常常會(huì)有一段文字顯示不同的顏色和字體红伦,或者給某幾個(gè)文字加刪除線或下劃線的需求英古。NSMuttableAttstring(帶屬性的字符串),可以靈活實(shí)現(xiàn)以上功能昙读。
NSMutableParagraphStyle段落風(fēng)格召调,設(shè)置行間距、段間距蛮浑、縮進(jìn)唠叛、對(duì)齊方式等。
1. 實(shí)例化方法和使用方法
實(shí)例化方法:
使用字符串初始化
- (id)initWithString:(NSString *)str;
//例:
NSMutableAttributedString *AttributedStr = [[NSMutableAttributedStringalloc]initWithString:@"文字樣式處理"];
字典中存放一些屬性名和屬性值:
- (id)initWithString:(NSString *)str attributes:(NSDictionary *)attrs;
//如:
NSDictionary *attributeDict = [NSDictionarydictionaryWithObjectsAndKeys:
[UIFontsystemFontOfSize:15.0],NSFontAttributeName,
[UIColorredColor],NSForegroundColorAttributeName,
NSUnderlineStyleAttributeName,NSUnderlineStyleSingle,nil];
NSMutableAttributedString *AttributedStr = [[NSMutableAttributedStringalloc]initWithString:@"文字樣式處理" attributes:attributeDict];
使用NSAttributedString初始化沮稚,跟NSMutableString艺沼,NSString類(lèi)似:
- (id)initWithAttributedString:(NSAttributedString *)attester;
使用方法:
為某一范圍內(nèi)文字設(shè)置多個(gè)屬性
- (void)setAttributes:(NSDictionary *)attrs range:(NSRange)range;
為某一范圍內(nèi)文字添加某個(gè)屬性
- (void)addAttribute:(NSString *)name value:(id)value range:(NSRange)range;
為某一范圍內(nèi)文字添加多個(gè)屬性
- (void)addAttributes:(NSDictionary *)attrs range:(NSRange)range;
移除某范圍內(nèi)的某個(gè)屬性
- (void)removeAttribute:(NSString *)name range:(NSRange)range;
2. 常見(jiàn)的屬性及說(shuō)明
NSFontAttributeName //字體
NSParagraphStyleAttributeName //段落格式
NSForegroundColorAttributeName //字體顏色
NSBackgroundColorAttributeName //背景顏色
NSStrikethroughStyleAttributeName //刪除線格式
NSUnderlineStyleAttributeName //下劃線格式
NSStrokeColorAttributeName //刪除線顏色
NSStrokeWidthAttributeName //刪除線寬度
NSShadowAttributeName //陰影
NSParagraphStyleAttributeName
段落的風(fēng)格(設(shè)置首行,行間距蕴掏,對(duì)齊方式什么的)
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
paragraphStyle.lineSpacing = 10;// 字體的行間距
paragraphStyle.firstLineHeadIndent = 20.0f;//首行縮進(jìn)
paragraphStyle.alignment = NSTextAlignmentJustified;//(兩端對(duì)齊的)文本對(duì)齊方式:(左障般,中,右盛杰,兩端對(duì)齊挽荡,自然)
paragraphStyle.lineBreakMode = NSLineBreakByTruncatingTail;//結(jié)尾部分的內(nèi)容以……方式省略 ( "...wxyz" ,"abcd..." ,"ab...yz")
paragraphStyle.headIndent = 20;//整體縮進(jìn)(首行除外)
paragraphStyle.tailIndent = 20;//
paragraphStyle.minimumLineHeight = 10;//最低行高
paragraphStyle.maximumLineHeight = 20;//最大行高
paragraphStyle.paragraphSpacing = 15;//段與段之間的間距
paragraphStyle.paragraphSpacingBefore = 22.0f;//段首行空白空間/* 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;//從左到右的書(shū)寫(xiě)方向(一共三種)
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;//連字屬性 在iOS,唯一支持的值分別為0和1
兩個(gè)樣式枚舉
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 */剪掉后面顯示不了的部分
NSLineBreakByTruncatingHead,/* Truncate at head of line: "...wxyz" */頭部分的內(nèi)容以……方式省略
NSLineBreakByTruncatingTail,/* Truncate at tail of line: "abcd..." */結(jié)尾部分的內(nèi)容以……方式省略
NSLineBreakByTruncatingMiddle/* Truncate middle of line: "ab...yz" */中間部分的內(nèi)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 左到右的書(shū)寫(xiě)方向
NSWritingDirectionRightToLeft = 1 // Right to left writing direction 右到左的書(shū)寫(xiě)方向
} NS_ENUM_AVAILABLE_IOS(6_0);
/*
NSFontAttributeName 字體大小
NSParagraphStyleAttributeName 段落的風(fēng)格(設(shè)置首行即供,行間距定拟,對(duì)齊方式什么的)
NSKernAttributeName 字間距
*/
NSDictionary *attributes = @{
NSFontAttributeName:[UIFont systemFontOfSize:15],
NSParagraphStyleAttributeName:paragraphStyle,
NSKernAttributeName:@(10),
};
textView.attributedText = [[NSAttributedString alloc] initWithString:textView.text attributes:attributes];
再來(lái)個(gè)實(shí)例
//隨便定義一個(gè)字符串,做測(cè)試使用
NSString *massageStr = @"\t北京烏托邦有限公司(以下簡(jiǎn)稱(chēng)“烏托邦”)在此特別提醒您(用戶)在注冊(cè)成為用戶之前逗嫡,請(qǐng)認(rèn)真閱讀本《用戶協(xié)議》(以下簡(jiǎn)稱(chēng)“協(xié)議”)办素,確保您充分理解本協(xié)議中各條款。請(qǐng)您審慎閱讀并選擇接受或不接受本協(xié)議祸穷。除非您接受本協(xié)議所有條款,否則您無(wú)權(quán)注冊(cè)勺三、登錄或使用本協(xié)議所涉服務(wù)雷滚。您的注冊(cè)、登錄吗坚、使用等行為將視為對(duì)本協(xié)議的接受祈远,并同意接受本協(xié)議各項(xiàng)條款的約束呆万。\r\n \t本協(xié)議約定烏托邦與用戶之間關(guān)于“烏托邦”軟件服務(wù)(以下簡(jiǎn)稱(chēng)“服務(wù)”)的權(quán)利義務(wù)〕捣荩“用戶”是指注冊(cè)谋减、登錄、使用本服務(wù)的個(gè)人扫沼。本協(xié)議可由烏托邦隨時(shí)更新出爹,更新后的協(xié)議條款一旦公布即代替原來(lái)的協(xié)議條款,恕不再另行通知缎除,用戶可在本網(wǎng)站查閱最新版協(xié)議條款严就。在烏托邦修改協(xié)議條款后,如果用戶不接受修改后的條款器罐,請(qǐng)立即停止使用烏托邦提供的服務(wù)梢为,用戶繼續(xù)使用烏托邦提供的服務(wù)將被視為接受修改后的協(xié)議。";
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:massageStr];
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
[paragraphStyle setLineSpacing:20];//調(diào)整行間距
[attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [self.agreementText length])];
[attributedString addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(0, 12)]; // 0為起始位置 length是從起始位置開(kāi)始 設(shè)置指定顏色的長(zhǎng)度
[attributedString addAttribute:NSForegroundColorAttributeName value:[UIColor blueColor] range:NSMakeRange(18, 3)];
//設(shè)置尺寸
[attributedString addAttribute:NSFontAttributeName value:[UIFont boldSystemFontOfSize:20] range:NSMakeRange(18, 3)]; // 0為起始位置 length是從起始位置開(kāi)始 設(shè)置指定字體尺寸的長(zhǎng)度
根據(jù)字符串獲取寬高
根據(jù)寬度求高度 content 計(jì)算的內(nèi)容 width 計(jì)算的寬度 font字體大小
+ (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;
}
根據(jù)高度度求寬度 content 計(jì)算的內(nèi)容 Height 計(jì)算的高度 font字體大小
+ (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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