//給UILabel設置行間距和字間距
-(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; //設置行間距
paraStyle.hyphenationFactor = 1.0;
paraStyle.firstLineHeadIndent = 0.0;
paraStyle.paragraphSpacingBefore = 0.0;
paraStyle.headIndent = 0;
paraStyle.tailIndent = 0;
//設置字間距 NSKernAttributeName:@1.5f
NSDictionary *dic = @{NSFontAttributeName:font, NSParagraphStyleAttributeName:paraStyle, NSKernAttributeName:@1.5f
};
NSAttributedString *attributeStr = [[NSAttributedString alloc] initWithString:str attributes:dic];
label.attributedText = attributeStr;
}
//計算UILabel的高度(帶有行間距的情況)
-(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 不可變屬性字符串,創建出來之后不能修改其屬性(屬性都是只讀的),但是可以在創建的時候直接附加屬性設置(屬性是針對所有文本),其屬性介紹以及用法,直接在代碼上標注如下:
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 = @"今日頭條是一款基于數據挖掘的推薦引擎產品,它為用戶推薦有價值的、個性化的信息,提供連接人與信息的新型服務,是國內移動互聯網領域成長最快的產品服務之一。";
NSMutableDictionary *dict = [NSMutableDictionary dictionary];
dict[NSForegroundColorAttributeName] = [UIColor redColor]; // UIColor,文本前景顏色,默認是blackColor dict[NSBackgroundColorAttributeName] = [UIColor yellowColor];// UIColor,文本背景顏色(不是控件View的背景顏色),默認nil dict[NSFontAttributeName] = [UIFont systemFontOfSize:20];// UIFont,文本字體大小,默認 Helvetica(Neue) 12
/* 文本段落樣式(詳細段落樣式見下方) // NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc]init]; // paragraphStyle.lineSpacing = 10; // 段落行距 */
dict[NSParagraphStyleAttributeName] = paragraphStyle; // NSParagraphStyle,文本段落樣式
/*//刪除線和下劃線
枚舉常量 NSUnderlineStyle中的值 NSUnderlineStyleNone //不設置刪除線 NSUnderlineStyleSingle // 設置刪除線為細單實線 NSUnderlineStyleThick // 設置刪除線為粗單實線 NSUnderlineStyleDouble // 設置刪除線為細雙實線 NSUnderlinePatternSolid NSUnderlinePatternDot //點 NSUnderlinePatternDash //虛線 NSUnderlinePatternDashDot //虛線和點 NSUnderlinePatternDashDotDot //虛線和點點 NSUnderlineByWord
*/ dict[NSStrikethroughStyleAttributeName] = @(NSUnderlinePatternSolid | NSUnderlineStyleSingle); // NSNumber,加刪除線,默認不加刪除線,其它的話是加不同風格的刪除線 dict[NSStrikethroughColorAttributeName] = [UIColor yellowColor]; // UIColor,刪除線顏色,默認等于文本前景顏色,前提是需要加刪除線,和NSStrikethroughStyleAttributeName有關 dict[NSUnderlineStyleAttributeName] = @(NSUnderlineStyleDouble); // NSNumber,加下劃線,默認NSUnderlineStyleNone不加下劃線,其它的話是加不同的下劃線 dict[NSUnderlineColorAttributeName] = [UIColor yellowColor]; // UIColor,下劃線顏色,默認等于文本前景顏色,前提是需要加下劃線,和NSUnderlineStyleAttributeName有關
dict[NSStrokeColorAttributeName] = [UIColor yellowColor]; // UIColor,默認等于文本前景顏色,需要和NSStrokeWidthAttributeName一起使用 dict[NSStrokeWidthAttributeName] = @5; // NSNumber,使文本有一種中空的效果(有立體效果)數字越大,文本填充的越滿,數字越小,文本顏色越淡,不需要和NSStrokeColorAttributeName一起使用 /* 文本陰影 NSShadow *shadow = [[NSShadow alloc] init]; shadow.shadowOffset = CGSizeMake(2, 3); 陰影偏移量 shadow.shadowColor = [UIColor yellowColor]; 陰影顏色 shadow.shadowBlurRadius = 1.0; 陰影圓角 */ dict[NSShadowAttributeName] = shadow; // NSShadow,默認沒有陰影,
dict[NSKernAttributeName] = @10; // NSNumber,文本字間距(字與字之間的距離) dict[NSLinkAttributeName] = [NSURL URLWithString:@"http:baidu.com"]; // NSURL或者是鏈接字符串,文本鏈接樣式,自帶下劃線,文本顏色是藍色 dict[NSLinkAttributeName] = @"http:baidu.com"; // NSURL或者是鏈接字符串,文本鏈接樣式,自帶下劃線,文本顏色是藍色 dict[NSExpansionAttributeName] = @(-0.5); // NSNumber,本文的擴張倍數,負數的話相當于縮小 dict[NSObliquenessAttributeName] = @(0.7); // NSNumber,本文的斜體程度以及斜體方向,默認0不歪斜,負數相當于右斜,正數相當于左斜,歪斜的程度由數字的大小決定 dict[NSBaselineOffsetAttributeName] = @(15.0); // NSNumber,行文本基線的偏移量 dict[NSWritingDirectionAttributeName] = @[@(NSWritingDirectionOverride),@(NSWritingDirectionRightToLeft)]; // 貌似是文本寫入方向 dict[NSVerticalGlyphFormAttributeName] = @(1); // 文本的垂直與水平,目前在[iOS](http://lib.csdn.net/base/ios),它總是水平,任何其他值的行為是未定義的 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可變屬性字符串,創建出來之后可修改其屬性,也可以給文本在某一個范圍內添加單個屬性或者字典屬性(一次性添加很多屬性),比如一個屬性字符串不同范圍的顏色不一樣,其屬性介紹以及用法,直接在代碼上標注如下:
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 = @"今日頭條是一款基于數據挖掘的推薦引擎產品,它為用戶推薦有價值的、個性化的信息,提供連接人與信息的新型服務,是國內移動互聯網領域成長最快的產品服務之一。"; 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<NSString *,id> *)#> range:<#(NSRange)#>]; // 添加字典屬性 [attributedString addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(0, 10)]; label.attributedText = attributedString;
NSMutableParagraphStyle的部分屬性:
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 */剪掉后面顯示不了的部分
NSLineBreakByTruncatingHead,/* Truncate at head of line: "...wxyz" */頭部分的內容以……方式省略
NSLineBreakByTruncatingTail,/* Truncate at tail of line: "abcd..." */結尾部分的內容以……方式省略
NSLineBreakByTruncatingMiddle/* Truncate middle of line: "ab...yz" */中間部分的內容以……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 左到右的書寫方向
NSWritingDirectionRightToLeft = 1 // Right to left writing direction 右到左的書寫方向
} NS_ENUM_AVAILABLE_IOS(6_0);
// NSParagraphStyleAttributeName 段落的風格(設置首行,行間距,對齊方式什么的)看自己需要什么屬性,寫什么
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
paragraphStyle.lineSpacing = 10;// 字體的行間距
paragraphStyle.firstLineHeadIndent = 20.0f;//首行縮進
paragraphStyle.alignment = NSTextAlignmentJustified;//(兩端對齊的)文本對齊方式:(左,中,右,兩端對齊,自然)
paragraphStyle.lineBreakMode = NSLineBreakByTruncatingTail;//結尾部分的內容以……方式省略 ( "...wxyz" ,"abcd..." ,"ab...yz")
paragraphStyle.headIndent = 20;//整體縮進(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;//從左到右的書寫方向(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
/*
NSFontAttributeName 字體大小
NSParagraphStyleAttributeName 段落的風格(設置首行,行間距,對齊方式什么的)
NSKernAttributeName 字間距
*/
NSDictionary *attributes = @{
NSFontAttributeName:[UIFont systemFontOfSize:15],
NSParagraphStyleAttributeName:paragraphStyle,
NSKernAttributeName:@(10),
};
textView.attributedText = [[NSAttributedString alloc] initWithString:textView.text attributes:attributes];
3、NSMutableParagraphStyle
用于設定文本段落有關設置,比如行間距,文本縮進,段間距等等,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 = @"今日頭條是一款基于數據挖掘的推薦引擎產品,它為用戶推薦有價值的、個性化的信息,提供連接人與信息的新型服務,是國內移動互聯網領域成長最快的產品服務之一。";
/* 文本段落樣式
// NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc]init];
// paragraphStyle.lineSpacing = 10; // 段落行距
// paragraphStyle.headIndent = 5; // 非首行文本縮進
// paragraphStyle.tailIndent = -20; // 文本縮進(右端)
// paragraphStyle.firstLineHeadIndent = 20; // 首行文本縮進
// paragraphStyle.alignment = NSTextAlignmentRight; // 文本對齊方式
// paragraphStyle.lineBreakMode = NSLineBreakByWordWrapping; // 折行方式
// paragraphStyle.baseWritingDirection = NSWritingDirectionLeftToRight; // 文本寫入方式
// paragraphStyle.lineHeightMultiple = 3.0; // 文本行間距是默認行間距的多少倍
// paragraphStyle.maximumLineHeight = 50; // 文本最大行距
// paragraphStyle.minimumLineHeight = 50; // 文本最小行距
// paragraphStyle.allowsDefaultTighteningForTruncation = YES; // 目前還不知道有什么作用
// paragraphStyle.hyphenationFactor = 1.0; // 設置每行的最后單詞是否截斷,在0.0-1.0之間,默認為0.0,越接近1.0單詞被截斷的可能性越大,
// paragraphStyle.paragraphSpacing = 10; // 段落后面的間距
// paragraphStyle.paragraphSpacingBefore = 20; //設置段與段之間的距離
*/
// dict[NSParagraphStyleAttributeName] = paragraphStyle; // NSParagraphStyle,文本段落樣式
label.attributedText = [[NSAttributedString alloc] initWithString:string attributes:dict];
屬性字符串基本上就那么多內容,只不過需要在應用中靈活運用而已。