iOS使用NSMutableAttributedString實現富文本小結

NSAttributedString

NSAttributedString對象管理適用於字元串中單個字元或字元範圍的字元串和關聯的屬性集（例如字體和字距）。NSAttributedString對象的預設字體是Helvetica 12點，可能與平臺的預設系統字體不同。因此，您可能希望創建適用於您的應用程式的非預設屬性的新字元串。您還可以使用NSParagraphStyle類及其子類NSMutableParagraphStyle來封裝NSAttributedString類使用的段落或標尺屬性。

實例化方法和使用方法

實例化方法

使用字元串初始化

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

代碼示例

NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:@"測試數據"];

字典中存放一些屬性名和屬性值

- (instancetype)initWithString:(NSString *)str attributes:(NSDictionary<NSString *,id> *)attrs;

代碼示例

NSDictionary *attributedDict = @{
                                     NSFontAttributeName:[UIFont systemFontOfSize:16.0],
                                     NSForegroundColorAttributeName:[UIColor redColor],
                                     NSUnderlineStyleAttributeName:@(NSUnderlineStyleThick)
                                     };
    NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:@"測試數據" attributes:attributedDict];

使用NSAttributedString初始化，與NSMutableString,NSString類似

- (instancetype)initWithAttributedString:(NSAttributedString *)attrStr;

使用方法

為某一範圍內的文字設置多個屬性的方法

- (void)setAttributes:(NSDictionary<NSString *,id> *)attrs range:(NSRange)range;

//代碼示例

NSString *string = @"測試數據";
NSDictionary *attributedDict = @{
                                     NSFontAttributeName:[UIFont systemFontOfSize:16.0],
                                     NSForegroundColorAttributeName:[UIColor redColor],
                                     NSUnderlineStyleAttributeName:@(NSUnderlineStyleThick)
                                     };
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:string];
    
[attributedString setAttributes:attributedDict range:NSMakeRange(0, string.length)];

為某一範圍內的文字添加某個屬性的方法

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

//代碼示例

NSString *string = @"測試數據";
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:string];
    
[attributedString addAttribute:NSForegroundColorAttributeName value:[UIColor blueColor] range:NSMakeRange(0, string.length)];

為某一範圍內的文字添加多個屬性的方法

- (void)addAttributes:(NSDictionary<NSString *,id> *)attrs range:(NSRange)range;

//代碼示例

NSString *string = @"測試數據";
NSDictionary *attributedDict = @{
                                     NSFontAttributeName:[UIFont systemFontOfSize:16.0],
                                     NSForegroundColorAttributeName:[UIColor redColor],
                                     NSUnderlineStyleAttributeName:@(NSUnderlineStyleThick)
                                     };
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:string];
    
[attributedString addAttributes:attributedDict range:NSMakeRange(0, string.length)];

移除某個範圍內的某個屬性的方法

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

//代碼示例

 NSString *string = @"測試數據";
 NSDictionary *attributedDict = @{
                                     NSFontAttributeName:[UIFont systemFontOfSize:16.0],
                                     NSForegroundColorAttributeName:[UIColor redColor],
                                     NSUnderlineStyleAttributeName:@(NSUnderlineStyleThick)
                                     };
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:string];
    
[attributedString addAttributes:attributedDict range:NSMakeRange(0, string.length)];
  
    
[attributedString removeAttribute:NSForegroundColorAttributeName range:NSMakeRange(0, string.length)];

屬性及說明

富文本段落排版格式屬性說明

作者：coder小鵬