iOS富文本－NSAttributedString简单封装

直接调用系统的写起来比较麻烦，封装一下

因为要简单所以就写类方法

WJAttributeStyle 基类

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
/**
 *  基类富文本
 */
@interface WJAttributeStyle : NSObject

@property (nonatomic,strong)NSString *attributeName;
@property (nonatomic,strong)id value;
@property (nonatomic,assign)NSRange range;

+ (WJAttributeStyle *)attributeName:(NSString *)attributeName value:(id)value range:(NSRange)range;

@end

#import "WJAttributeStyle.h"

@implementation WJAttributeStyle

+ (WJAttributeStyle *)attributeName:(NSString *)attributeName value:(id)value range:(NSRange)range {
    WJAttributeStyle *style = [[self class] new];
    style.attributeName = attributeName;
    style.value = value;
    style.range = range;
    return style;
}

@end

 衍生，继承于上面的基类封装颜色，和大小之后写起来会更简单

颜色：

#import "WJAttributeStyle.h"
#import "WJForeGroundColorStyle.h"

/**
 *  颜色富文本
 */
@interface WJForeGroundColorStyle : WJAttributeStyle

+ (WJForeGroundColorStyle *)withColor:(UIColor *)color range:(NSRange)range;

@end

#import "WJForeGroundColorStyle.h"

@implementation WJForeGroundColorStyle

+ (WJForeGroundColorStyle *)withColor:(UIColor *)color range:(NSRange)range {
    WJForeGroundColorStyle *style =
    (WJForeGroundColorStyle *)[WJForeGroundColorStyle attributeName:NSForegroundColorAttributeName value:color range:range];
    return style;
}

@end

 大小：

#import "WJAttributeStyle.h"
/**
 *  大小富文本
 */
@interface WJFontStyle : WJAttributeStyle

+ (WJFontStyle *)withFonte:(UIFont *)font range:(NSRange)range;

@end

#import "WJFontStyle.h"

@implementation WJFontStyle

+ (WJFontStyle *)withFonte:(UIFont *)font range:(NSRange)range {
    WJFontStyle *style =
    (WJFontStyle *)[WJFontStyle attributeName:NSFontAttributeName value:font range:range];
    return style;
}
@end

 然后用个类目来给字符串设置属性文字

#import <Foundation/Foundation.h>
#import "WJAttributeStyle.h"
#import "WJForeGroundColorStyle.h"
#import "WJFontStyle.h"
@interface NSString (WJAttributeStyle)

/**
 *  根据styles数组创建出富文本
 *
 *  @param styles WJAttributeStyle对象构成的数组
 *
 *  @return 富文本
 */
- (NSAttributedString *)createAttributeStringWithStyles:(NSArray *)styles;

@end

#import "NSString+WJAttributeStyle.h"

@implementation NSString (WJAttributeStyle)

- (NSAttributedString *)createAttributeStringWithStyles:(NSArray *)styles {
    if (self.length <= 0) {
        return nil;
    }
    NSMutableAttributedString *attributeString = [[NSMutableAttributedString alloc]initWithString:self];
    for (int i = 0; i < styles.count; i ++) {
        WJAttributeStyle *style = styles[i];
        [attributeString addAttribute:style.attributeName
                                value:style.value
                                range:style.range];
        
    }
    return attributeString;
}

@end

使用：

    NSString *string = @"这是一个测试";
    _label.attributedText = [string createAttributeStringWithStyles:
                             @[[WJAttributeStyle attributeName:NSForegroundColorAttributeName
                                                         value:[UIColor redColor]
                                                         range:NSMakeRange(0, 1)],
                               [WJForeGroundColorStyle withColor:[UIColor grayColor] range:NSMakeRange(1, 1)],
                               [WJFontStyle withFonte:[UIFont systemFontOfSize:30] range:NSMakeRange(2, 1)]
                               ]];

扩展UIKit:https://github.com/YouXianMing/BookTextView

开源富文本:https://github.com/nicolasgoutaland/GONMarkupParser

图文混排：https://github.com/12207480/TYAttributedLabel