富文字的封裝-NSAttributedString 的簡易封裝
有時我們經常寫富文老是寫出這樣子的出來，極易出錯而且可讀性非常差，如下：
- (void)typeOne{
NSString *string =@"你好,CSDN!";
NSMutableAttributedString *attributedString = [[NSMutableAttributedStringalloc] initWithString:string];
// 設定富文字樣式
[attributedString addAttribute:NSForegroundColorAttributeName
value:[UIColorredColor]
range:NSMakeRange(0,1)];
[attributedStringaddAttribute:NSFontAttributeName
value:[UIFontsystemFontOfSize:24.f]
range:NSMakeRange(0,2)];
UILabel *label = [[UILabelalloc] initWithFrame:CGRectMake(0
label.attributedText = attributedString;
[self.viewaddSubview:label];
}
- (void)typeTwo {
NSString *string = @"你好,CSDN!";
NSMutableAttributedString *attributedString = [[NSMutableAttributedStringalloc] initWithString:string];
// 設定富文字樣式
[attributedString addAttribute:NSForegroundColorAttributeName
value:[UIColorredColor]
range:NSMakeRange(0,1)];
[attributedStringaddAttribute:NSFontAttributeName
value:[UIFontsystemFontOfSize:24.f]
range:NSMakeRange(0,2)];
UILabel *label = [[UILabelalloc] initWithFrame:CGRectMake(0,100,320, 30)];
label.attributedText = attributedString;
[self.viewaddSubview:label];
}
- (void)typeThree {
NSString *string =@"你好,CSDN!你好,CSDN!\n你好,CSDN!";
NSMutableAttributedString *attributedString = [[NSMutableAttributedStringalloc] initWithString:string];
// 設定富文字 - 段落樣式
NSMutableParagraphStyle *style = [[NSMutableParagraphStylealloc] init];
style.lineSpacing =10.f;
style.paragraphSpacing =20.f;
[attributedString addAttribute:NSParagraphStyleAttributeName
value:style
range:NSMakeRange(0, string.length)];
UILabel *label = [[UILabelalloc] initWithFrame:CGRectMake(0,100,320, 400)];
// 設定段落樣式的時候，numberOfLines必須為0
label.numberOfLines =0;
label.attributedText = attributedString;
[self.viewaddSubview:label];
}
我們可以封裝，一個父類AttributedStyle，顏色和字型類都繼承父類AttributedStyle，再寫一個NSString的分類，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;
/**
* 便利構造器
*
* @param attributeName屬性名字
* @param value 設定的值
* @param range 取值範圍
*
* @return 例項物件
*/
+ (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 = [[selfclass] 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
/**
* 行內函數
*
* @param color 顏色
* @param range 範圍
*
* @return 例項物件
*/
staticinline AttributedStyle* colorStyle(UIColor *color,NSRange range) {
return [ForeGroundColorStylewithColor:color range:range];
}
#import "ForeGroundColorStyle.h"
@implementation ForeGroundColorStyle
+ (id)withColor:(UIColor *)color range:(NSRange)range {
id style = [superattributeName:NSForegroundColorAttributeName
value:color
range:range];
return style;
}
@end
#import "AttributedStyle.h"
@interface FontStyle :AttributedStyle
+ (id)withFont:(UIFont *)font range:(NSRange)range;
@end
/**
* 行內函數
*
* @param font 字型
* @param range 範圍
*
* @return 例項物件
*/
staticinline AttributedStyle* fontStyle(UIFont *font,NSRange range) {
return [FontStylewithFont:font range:range];
}
#import "FontStyle.h"
@implementation FontStyle
+ (id)withFont:(UIFont *)font range:(NSRange)range {
id fontStyle = [superattributeName:NSFontAttributeName
value:font
range:range];
return fontStyle;
}
@end
#import "FontStyle.h"
@implementation FontStyle
+ (id)withFont:(UIFont *)font range:(NSRange)range {
id fontStyle = [superattributeName:NSFontAttributeName
value:font
range:range];
return fontStyle;
}
@end
#import <Foundation/Foundation.h>
#import "AttributedStyle.h"
@interface NSString (AttributeStyle)
/**
* 根據styles陣列創建出富文字
*
* @param styles AttributedStyle物件構成的陣列
*
* @return 富文字
*/
- (NSAttributedString *)createAttributedStringWithStyles:(NSArray *)styles;
@end
#import "NSString+AttributeStyle.h"
@implementation NSString (AttributeStyle)
- (NSAttributedString *)createAttributedStringWithStyles:(NSArray *)styles {
if (self.length <=0) {
return nil;
}
NSMutableAttributedString *attributedString = [[NSMutableAttributedStringalloc] initWithString:self];
for (int count =0; count < styles.count; count++) {
AttributedStyle *style = styles[count];
[attributedStringaddAttribute:style.attributeName
value:style.value
range:style.range];
}
return attributedString;
}
@end
如下使用，簡單多了，清晰明瞭
#import "NSString+AttributeStyle.h"
#import "ForeGroundColorStyle.h"
#import "FontStyle.h"
- (void)viewDidLoad {
[superviewDidLoad];
NSString *string = @"你好,CSDN!";
UILabel *label = [[UILabelalloc] initWithFrame:CGRectMake(0,100,320, 30)];
label.attributedText = \
[string createAttributedStringWithStyles:\
@[colorStyle([UIColorredColor], NSMakeRange(0,2)),
fontStyle ([UIFontsystemFontOfSize:20.f],NSMakeRange(1,2))]];
[self.viewaddSubview:label];
}
@end
使用開原始碼 GONMarkupParser處理富文字
GONMarkupParse 下載地址：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 [NSStringstringWithFormat:@"<color value=\"%@\">%@</>", mark,self];
}
- (NSAttributedString *)createAttributedString {
return [[GONMarkupParserManagersharedParser] attributedStringFromString:self
error:nil];
}
@end
#import "NSString+GONMarkupDemo.h"
- (void)viewDidLoad {
[superviewDidLoad];
NSString *strOne = @"My";
NSString *strTwo = @"name";
NSString *string = [NSStringstringWithFormat:@"%@ %@ is XX",
[strOneaddColorMark:@"red"],
[strTwoaddColorMark:@"green"]];
UILabel *label = [[UILabelalloc] initWithFrame:CGRectMake(0,100,320, 200)];
label.numberOfLines =0;
label.attributedText = [stringcreateAttributedString];
[self.viewaddSubview:label];
}
@end