ios学习--属性字符串NSAttributeString与NSString相互转换包含图片和emoji图
分享几个常用的 属性字符串NSAtrributeString 和 NSString 普通字符串的 转换方法:
一:把普通的字符串,替换为包含图片的属性字符串
plist 文件,图片 格式见下图:
|
1
2
3
4
5
6
7
8
|
+(NSMutableAttributedString *)stringToAttributeString:(NSString *)text
{
//先把普通的字符串text转化生成Attributed类型的字符串
NSMutableAttributedString * attStr = [[NSMutableAttributedString alloc]initWithString:text];
NSString * zhengze = @\[[a-zA-Z0-
9
\u4e00-\u9fa5]+\];
//正则表达式 ,例如 [呵呵] 这种形式的通配符
NSError * error;
|
|
1
|
|
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
|
if
(!re)
{
NSLog(@%@,[error localizedDescription]);
//打印错误
}
NSArray * arr = [re matchesInString:text options:
0
range:NSMakeRange(
0
, text.length)];
//遍历字符串,获得所有的匹配字符串
NSBundle *bundle = [NSBundle mainBundle];
NSString * path = [bundle pathForResource:
@emotions
ofType:
@plist
];
//plist文件,制作一个 数组,包含文字,表情图片名称
NSArray * face = [[NSArray alloc]initWithContentsOfFile:path];
//获取 所有的数组
//如果有多个表情图，必须从后往前替换，因为替换后Range就不准确了
for
(
int
j =(
int
) arr.count -
1
; j >=
0
; j--) {
//NSTextCheckingResult里面包含range
NSTextCheckingResult * result = arr[j];
for
(
int
i =
0
; i < face.count; i++) {
if
([[text substringWithRange:result.range] isEqualToString:face[i][
@chs
]])
//从数组中的字典中取元素
{
NSString * imageName = [NSString stringWithString:face[i][
@png
]];
NSTextAttachment * textAttachment = [[NSTextAttachment alloc]init];
//添加附件,图片
textAttachment.image = [UIImage imageNamed:imageName];
NSAttributedString * imageStr = [NSAttributedString attributedStringWithAttachment:textAttachment];
[attStr replaceCharactersInRange:result.range withAttributedString:imageStr];
//替换未图片附件
break
;
}
}
}
return
attStr;
}
|
二:获取属性字符串的size大小:
注:对包含文字和图片的属性字符串,需要根据实际情况,调节其大小
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
|
+(CGSize)getAttributedTextSize:(NSString *)text
{
//先把普通的字符串text转化生成Attributed类型的字符串
NSMutableAttributedString * attStr = [[NSMutableAttributedString alloc]initWithString:text];
NSString * zhengze = @\[[a-zA-Z0-
9
\u4e00-\u9fa5]+\];
NSError * error;
NSRegularExpression * re = [NSRegularExpression regularExpressionWithPattern:zhengze options:NSRegularExpressionCaseInsensitive error:&error];
if
(!re)
{
NSLog(@正则表达式匹配错误%@,[error localizedDescription]);
}
NSArray * arr = [re matchesInString:text options:
0
range:NSMakeRange(
0
, text.length)];
if
(!arr.count)
//说明字符串中没有表情通配符,是普通的文本,则计算文本size
{
NSDictionary *dic=@{NSFontAttributeName: [UIFont systemFontOfSize:
14
]};
CGSize size1=[text boundingRectWithSize:CGSizeMake(
160
,
1000
) options:NSStringDrawingUsesLineFragmentOrigin attributes:dic context:nil].size;
if
(size1.height<=
60
)
{
size1.height=
60
;
}
else
{
size1.height+=
15
;
}
return
size1;
}
NSBundle *bundle = [NSBundle mainBundle];
NSString * path = [bundle pathForResource:
@emotions
ofType:
@plist
];
NSArray * face = [[NSArray alloc]initWithContentsOfFile:path];
//如果有多个表情图，必须从后往前替换，因为替换后Range就不准确了
for
(
int
j =(
int
) arr.count -
1
; j >=
0
; j--) {
//NSTextCheckingResult里面包含range
NSTextCheckingResult * result = arr[j];
for
(
int
i =
0
; i < face.count; i++) {
if
([[text substringWithRange:result.range] isEqualToString:face[i][
@chs
]])
{
NSString * imageName = [NSString stringWithString:face[i][
@png
]];
NSTextAttachment * textAttachment = [[NSTextAttachment alloc]init];
textAttachment.image = [UIImage imageNamed:imageName];
NSAttributedString * imageStr = [NSAttributedString attributedStringWithAttachment:textAttachment];
[attStr replaceCharactersInRange:result.range withAttributedString:imageStr];
break
;
}
}
}
CGSize size2=[attStr boundingRectWithSize:CGSizeMake(
180
,
1000
) options:NSStringDrawingUsesLineFragmentOrigin context:nil].size;
size2.height+=
40
;
//表情文字增加高度
return
size2;
//返回属性字符串的尺寸
}
|
三: 属性字符串转为普通字符串, 关键点: 图片的二进制比对(可以放入到一个 子线程去做)
图片二进制比对,获得图片名称:
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
|
//不能直接得到串的名字?
-(NSString *)stringFromImage:(UIImage *)image
{
NSArray *face=[self getAllImagePaths];
NSData * imageD = UIImagePNGRepresentation(image);
NSString * imageName;
for
(
int
i=
0
; i-(NSString *)textString
{
NSAttributedString * att = self.attributedText;
NSMutableAttributedString * resutlAtt = [[NSMutableAttributedString alloc]initWithAttributedString:att];
__weak __block UITextView * copy_self = self;
//枚举出所有的附件字符串
[att enumerateAttributesInRange:NSMakeRange(
0
, att.length) options:NSAttributedStringEnumerationReverse usingBlock:^(NSDictionary *attrs, NSRange range, BOOL *stop) {
//key-NSAttachment
//NSTextAttachment value类型
NSTextAttachment * textAtt = attrs[
@NSAttachment
];
//从字典中取得那一个图片
if
(textAtt)
{
UIImage * image = textAtt.image;
NSString * text = [copy_self stringFromImage:image];
[resutlAtt replaceCharactersInRange:range withString:text];
}
}];
return
resutlAtt.string;
}
转载自：http://www.2cto.com/kf/201501/372511.html
|