iOS中使用NSAttributedString、NSMutableAttributedString 实现富文本

NSMutableAttributedString 实现富文本

1.实例化方法和使用方法

 实例化方法：

 使用字符串初始化

- (id)initWithString:(NSString *)str;

例：

NSMutableAttributedString *AttributedStr = [[NSMutableAttributedStringalloc]initWithString:@"今天天气不错呀"];

使用字符串和富文本格式的初始化

- (id)initWithString:(NSString *)str attributes:(NSDictionary *)attrs;

 

字典中存放一些属性名和属性值，如：

NSDictionary *attributeDict = [NSDictionarydictionaryWithObjectsAndKeys:

                               [UIFontsystemFontOfSize:15.0],NSFontAttributeName,

                               [UIColor redColor],NSForegroundColorAttributeName,

                               NSUnderlineStyleAttributeName,NSUnderlineStyleSingle,nil];

NSMutableAttributedString *AttributedStr = [[NSMutableAttributedStringalloc]initWithString:@"今天天气不错呀" attributes:attributeDict];

 

使用NSAttributedString初始化，跟NSMutableString，NSString类似

- (id)initWithAttributedString:(NSAttributedString *)attester;

 // initWithString:  
 NSAttributedString *attributedString_str = [[NSAttributedString alloc] initWithString:@"attributedString"];  
 NSLog(@"%@", attributedString_str);  
 // textView.attributedText = attributedString_str;  
   
   
 // initWithAttributedString:  
 NSAttributedString *attributedString_atts = [[NSAttributedString alloc] initWithAttributedString:attributedString_str];  
 NSLog(@"%@", attributedString_atts);  
 // textView.attributedText = attributedString_atts;  
   
// initWithString:attributes:  
 UIColor *backgroundColor = [UIColor blackColor];  
 NSNumber *baseLineOffset = [NSNumber numberWithFloat:20.0];  
 UIColor *foregroundColor = [UIColor whiteColor];  
 NSNumber *kern = [NSNumber numberWithFloat:5.0];  
 NSNumber *ligature = [NSNumber numberWithFloat:3.0];  
 NSURL *linkURL = [NSURL URLWithString:@"http://www.baidu.com"];  
NSNumber *underline = [NSNumber numberWithInt:NSUnderlineStyleSingle];  
 NSDictionary *attrsDic = @{NSForegroundColorAttributeName: foregroundColor,  
                           NSBackgroundColorAttributeName: backgroundColor,  
                          NSBaselineOffsetAttributeName: baseLineOffset,  
                           NSKernAttributeName: kern,  
                          NSLigatureAttributeName: ligature,  
                           NSLinkAttributeName: linkURL,  
                           NSUnderlineStyleAttributeName: underline  
                           };  
 NSAttributedString *attributedString_str_atts = [[NSAttributedString alloc] initWithString:@"http://www.baidu.com" attributes:attrsDic];  
 NSLog(@"%@", attributedString_str_atts);  
 // textView.attributedText = attributedString_str_atts;  
   
   
 // initWithFileURL:options:documentAttributes:error:  
 NSURL *fileURL = nil;  
 fileURL = [[NSBundle mainBundle] URLForResource:@"Dynamic Coloring" withExtension:@"rtf"];  
 NSAttributedString *attributedString_fileURL = [[NSAttributedString alloc] initWithFileURL:fileURL options:@{} documentAttributes:nil error:nil];  
 NSLog(@"%@", attributedString_fileURL);  
 // textView.attributedText = attributedString_fileURL;  
   
   
 // initWithData:options:documentAttributes:error:  
 fileURL = nil;  
 fileURL = [[NSBundle mainBundle] URLForResource:@"View Layout" withExtension:@"rtf"];  
 NSData *data = [[NSData alloc] initWithContentsOfURL:fileURL];  
 NSAttributedString *attributedString_data = [[NSAttributedString alloc] initWithData:data options:@{} documentAttributes:nil error:nil];  
 NSLog(@"%@", attributedString_data);  
 // textView.attributedText = attributedString_data;  
   
  
 // initWithAttributedString:  
 NSMutableAttributedString *mutableAttributedString_attrs = [[NSMutableAttributedString alloc] initWithAttributedString:attributedString_fileURL]; 

//使用方法：

//为某一范围内文字设置多个属性

- (void)setAttributes:(NSDictionary *)attrs range:(NSRange)range;

//为某一范围内文字添加某个属性

- (void)addAttribute:(NSString *)name value:(id)value range:(NSRange)range;

//为某一范围内文字添加多个属性

- (void)addAttributes:(NSDictionary *)attrs range:(NSRange)range;

//移除某范围内的某个属性

- (void)removeAttribute:(NSString *)name range:(NSRange)range;

2.     常见的属性及说明

//字体

NSFontAttributeName

//段落格式

NSParagraphStyleAttributeName

//字体颜色

NSForegroundColorAttributeName

//背景颜色

NSBackgroundColorAttributeName

//删除线格式

NSStrikethroughStyleAttributeName

//下划线格式

NSUnderlineStyleAttributeName

删除线颜色

NSStrokeColorAttributeName

删除线宽度

NSStrokeWidthAttributeName

阴影

NSShadowAttributeName

3.应用实例

//应用实例

NSString *label_text1 = @"大家好我是一个Label，教大家实现富文本";

    NSMutableAttributedString *attributedString1 = [[NSMutableAttributedString alloc]initWithString:label_text1];

    

    [attributedString1 addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:20] range:NSMakeRange(0, label_text1.length)];

    [attributedString1 addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(12, 2)];

    [attributedString1 addAttribute:NSForegroundColorAttributeName value:[UIColor blueColor] range:NSMakeRange(17, 2)];

    //最好设置一下行高(每行字之间的距离（行间距）)，不设的话默认是0

    NSMutableParagraphStyle *sty = [[NSMutableParagraphStyle alloc] init];

    sty.lineSpacing = 5;

    [attributedString1 addAttribute:NSParagraphStyleAttributeName value:sty range:NSMakeRange(0, label_text1.length)];

    

    UILabel *ybLabel1 = [[UILabel alloc] initWithFrame:CGRectMake(10, 100, self.view.bounds.size.width - 20, 60)];

    ybLabel1.backgroundColor = [UIColor yellowColor];

    ybLabel1.numberOfLines = 2;

    ybLabel1.attributedText = attributedString1;

应用实例
//下划线格式
NSUnderlineStyleAttributeName
NSMutableAttributedString *attributedStr = [[NSMutableAttributedString alloc]initWithString:_forgetPasswordLabel.text];

        [attributedStr addAttribute:NSUnderlineStyleAttributeName value:[NSNumber numberWithInteger:NSUnderlineStyleSingle] range:NSMakeRange(0, _forgetPasswordLabel.text.length)];


//删除线格式
NSMutableAttributedString *attributedStr = [[NSMutableAttributedString alloc]initWithString:_marketPriceLabel.text];

        [attributedStr addAttribute:NSStrikethroughStyleAttributeName value:@(NSUnderlinePatternSolid | NSUnderlineStyleSingle) range:NSMakeRange(0, _marketPriceLabel.text.length)];

//删除线颜色
        [attributedStr addAttribute:NSStrokeColorAttributeName value:[UIColor darkGrayColor] range:NSMakeRange(0, _marketPriceLabel.text.length)];


//设置行间距 

  NSMutableParagraphStyle *sty = [[NSMutableParagraphStyle alloc] init];
  sty.lineSpacing = 5;
  [attributedString1 addAttribute:NSParagraphStyleAttributeName value:sty range:NSMakeRange(0, label_text1.length)];

//富文本 下划线的几种样式
typedef NS_ENUM(NSInteger, NSUnderlineStyle) {
    NSUnderlineStyleNone                                   
    NSUnderlineStyleSingle         //单下划线                        
    NSUnderlineStyleThick          //加粗效果下划线
    NSUnderlineStyleDouble        //双下划綫

    NSUnderlinePatternSolid 
    NSUnderlinePatternDot 
    NSUnderlinePatternDash 
    NSUnderlinePatternDashDot 
    NSUnderlinePatternDashDotDot 

    NSUnderlineByWord 
} 

看完了是不是 很有感觉呀！这样你就学会了给一行字设置不同的格式了！