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一、NSMuttableAttstring實例化方法
1.實例化方法：
使用字符串初始化
- (id)initWithString:(NSString?*)str;
- (id)initWithString:(NSString?*)str attributes:(NSDictionary?*)attrs;
2.字典中存放一些屬性名和屬性值，如：
NSDictionary?*attributeDict = [NSDictionarydictionaryWithObjectsAndKeys:
[UIFontsystemFontOfSize:15.0],NSFontAttributeName,
[UIColorredColor],NSForegroundColorAttributeName,
NSUnderlineStyleAttributeName,NSUnderlineStyleSingle,nil];
NSMutableAttributedString*AttributedStr = [[NSMutableAttributedStringalloc]initWithString:@"今天我很帥"attributes:attributeDict];
- (id)initWithAttributedString:(NSAttributedString?*)attester;
注意:使用NSAttributedString初始化，跟NSMutableString，NSString類似
二、NSMuttableAttstring使用方法
1.使用方法
為某一范圍內文字設置多個屬性
- (void)setAttributes:(NSDictionary?*)attrs range:(NSRange)range;
為某一范圍內文字添加某個屬性
- (void)addAttribute:(NSString?*)name value:(id)value range:(NSRange)range;
為某一范圍內文字添加多個屬性
- (void)addAttributes:(NSDictionary?*)attrs range:(NSRange)range;
移除某范圍內的某個屬性
- (void)removeAttribute:(NSString?*)name range:(NSRange)range;
2.常見的屬性及說明
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
更多方法和屬性說明詳見蘋果官方說明文檔：點擊打開鏈接
https://developer.apple.com/library/ios/documentation/Cocoa/Reference/Foundation/Classes/NSMutableAttributedString_Class/Reference/Reference.html#//apple_ref/doc/uid/TP40003689
3.使用實例：
//描述設置行距
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];[paragraphStyle setLineSpacing:4.0f];
//設置字體
NSDictionary*deitalAttributes =@{NSFontAttributeName :lbl_fetusDesc.font,
NSParagraphStyleAttributeName: paragraphStyle};
NSString*descStr = (self.topViewType == PregnantTopViewTypePregnant) ? _pregInfo.personateFetusAdviceDesc? : _pregInfo.bbchange;
NSMutableAttributedString*attributedString = [[NSMutableAttributedStringalloc]initWithString:descStr];
[attributedString addAttributes:deitalAttributes range:NSMakeRange(0, [descStr length])];
