有时我们经常写富文老是写出这样子的出来，极易出错而且可读性非常差，如下：
- (void)typeOne{
NSString *string =
@"你好,CSDN!";
NSMutableAttributedString *attributedString = [[NSMutableAttributedString
alloc]
initWithString:string];
//
设置富文本样式
[attributedString
addAttribute:NSForegroundColorAttributeName
value:[UIColor
redColor]
range:NSMakeRange(0,
1)];
[attributedString
addAttribute:NSFontAttributeName
value:[UIFont
systemFontOfSize:24.f]
range:NSMakeRange(0,
2)];
UILabel *label = [[UILabel
alloc] initWithFrame:CGRectMake(0,
100, 320,
30)];
label.attributedText = attributedString;
[self.view
addSubview:label];
}
- (void)typeTwo {
NSString *string =
@"你好,CSDN!";
NSMutableAttributedString *attributedString = [[NSMutableAttributedString
alloc]
initWithString:string];
//
设置富文本样式
[attributedString
addAttribute:NSForegroundColorAttributeName
value:[UIColor
redColor]
range:NSMakeRange(0,
1)];
[attributedString
addAttribute:NSFontAttributeName
value:[UIFont
systemFontOfSize:24.f]
range:NSMakeRange(0,
2)];
UILabel *label = [[UILabel
alloc] initWithFrame:CGRectMake(0,
100, 320,
30)];
label.attributedText = attributedString;
[self.view
addSubview:label];
}
- (void)typeThree {
NSString *string =
@"你好,CSDN! 你好,CSDN!\n你好,CSDN!";
NSMutableAttributedString *attributedString = [[NSMutableAttributedString
alloc]
initWithString:string];
//
设置富文本 - 段落样式
NSMutableParagraphStyle *style = [[NSMutableParagraphStyle
alloc]
init];
style.lineSpacing =
10.f;
style.paragraphSpacing =
20.f;
[attributedString
addAttribute:NSParagraphStyleAttributeName
value:style
range:NSMakeRange(0, string.length)];
UILabel *label = [[UILabel
alloc] initWithFrame:CGRectMake(0,
100, 320,
400)];
//
设置段落样式的时候，numberOfLines必须为0
label.numberOfLines =
0;
label.attributedText = attributedString;
[self.view
addSubview:label];
}
我们可以封装，一个父类AttributedStyle，颜色和字体类都继承父类AttributedStyle，再写一个NSString的分类，如下：
#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
@interface AttributedStyle :
NSObject
@property (nonatomic,
strong) NSString *attributeName;
@property (nonatomic,
strong) id value;
@property (nonatomic)
NSRange range;
/**
* 便利构造器
*
* @param attributeName
属性名字
* @param value
设置的值
* @param range
取值范围
*
* @return
实例对象
*/
+ (AttributedStyle *)attributeName:(NSString *)attributeName value:(id)value
range:(NSRange)range;
@end
#import "AttributedStyle.h"
@implementation AttributedStyle
+ (AttributedStyle *)attributeName:(NSString *)attributeName value:(id)value
range:(NSRange)range {
AttributedStyle *style = [[self
class] new];
style.attributeName = attributeName;
style.value = value;
style.range = range;
return style;
}
@end
#import "AttributedStyle.h"
@interface ForeGroundColorStyle :
AttributedStyle
+ (id)withColor:(UIColor *)color range:(NSRange)range;
@end
/**
* 内联函数
*
* @param color
颜色
* @param range
范围
*
* @return
实例对象
*/
static
inline AttributedStyle* colorStyle(UIColor *color,
NSRange range) {
return [ForeGroundColorStyle
withColor:color range:range];
}
#import "ForeGroundColorStyle.h"
@implementation ForeGroundColorStyle
+ (id)withColor:(UIColor *)color range:(NSRange)range {
id style = [super
attributeName:NSForegroundColorAttributeName
value:color
range:range];
return style;
}
@end
#import "AttributedStyle.h"
@interface FontStyle :
AttributedStyle
+ (id)withFont:(UIFont *)font range:(NSRange)range;
@end
/**
* 内联函数
*
* @param font
字体
* @param range
范围
*
* @return
实例对象
*/
static
inline AttributedStyle* fontStyle(UIFont *font,
NSRange range) {
return [FontStyle
withFont:font range:range];
}
#import "FontStyle.h"
@implementation FontStyle
+ (id)withFont:(UIFont *)font range:(NSRange)range {
id fontStyle = [super
attributeName:NSFontAttributeName
value:font
range:range];
return fontStyle;
}
@end
#import "FontStyle.h"
@implementation FontStyle
+ (id)withFont:(UIFont *)font range:(NSRange)range {
id fontStyle = [super
attributeName:NSFontAttributeName
value:font
range:range];
return fontStyle;
}
@end
#import <Foundation/Foundation.h>
#import "AttributedStyle.h"
@interface NSString (AttributeStyle)
/**
* 根据styles数组创建出富文本
*
* @param styles AttributedStyle对象构成的数组
*
* @return
富文本
*/
- (NSAttributedString *)createAttributedStringWithStyles:(NSArray *)styles;
@end
#import "NSString+AttributeStyle.h"
@implementation NSString (AttributeStyle)
- (NSAttributedString *)createAttributedStringWithStyles:(NSArray *)styles {
if (self.length <=
0) {
return nil;
}
NSMutableAttributedString *attributedString = [[NSMutableAttributedString
alloc]
initWithString:self];
for (int count =
0; count < styles.count; count++) {
AttributedStyle *style = styles[count];
[attributedString
addAttribute:style.attributeName
value:style.value
range:style.range];
}
return attributedString;
}
@end
如下使用，简单多了，清晰明了
#import "NSString+AttributeStyle.h"
#import "ForeGroundColorStyle.h"
#import "FontStyle.h"
- (void)viewDidLoad {
[super
viewDidLoad];
NSString *string =
@"你好,CSDN!";
UILabel *label = [[UILabel
alloc] initWithFrame:CGRectMake(0,
100, 320,
30)];
label.attributedText = \
[string createAttributedStringWithStyles:\
@[colorStyle([UIColor
redColor],
NSMakeRange(0,
2)),
fontStyle ([UIFont
systemFontOfSize:20.f],
NSMakeRange(1,
2))]];
[self.view
addSubview:label];
}
@end
使用开源代码 GONMarkupParser 处理富文本
GONMarkupParse 下载地址：http://download.csdn.net/detail/baitxaps/8912439
#import <Foundation/Foundation.h>
#import "GONMarkupParser_All.h"
@interface NSString (GONMarkupDemo)
- (NSString *)addColorMark:(NSString *)mark;
- (NSAttributedString *)createAttributedString;
@end
#import "NSString+GONMarkupDemo.h"
@implementation NSString (GONMarkupDemo)
- (NSString *)addColorMark:(NSString *)mark {
if (self.length <=
0) {
return nil;
}
return [NSString
stringWithFormat:@"<color value=\"%@\">%@</>", mark,
self];
}
- (NSAttributedString *)createAttributedString {
return [[GONMarkupParserManager
sharedParser] attributedStringFromString:self
error:nil];
}
@end
#import "NSString+GONMarkupDemo.h"
- (void)viewDidLoad {
[super
viewDidLoad];
NSString *strOne =
@"My";
NSString *strTwo =
@"name";
NSString *string = [NSString
stringWithFormat:@"%@ %@ is XX",
[strOne
addColorMark:@"red"],
[strTwo
addColorMark:@"green"]];
UILabel *label = [[UILabel
alloc] initWithFrame:CGRectMake(0,
100, 320,
200)];
label.numberOfLines =
0;
label.attributedText = [string
createAttributedString];
[self.view
addSubview:label];
}
@end
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