常规字符串NSString
字符串是否包含子串
// 利用range
[dateStr rangeOfString:@"an"].location == NSNotFound
// iOS 8.0 later
[dateStr containsString:@"an"];
判断只有数字、小数点和减号
#define NUMBERS @"0123456789.-"
#pragma mark -是否只包含数字，小数点，负号
- (BOOL)isOnlyhasNumberAndpointWithString:(NSString *)string
{
NSCharacterSet *cs=[[NSCharacterSet characterSetWithCharactersInString:NUMBERS] invertedSet];
NSString *filter=[[string componentsSeparatedByCharactersInSet:cs] componentsJoinedByString:@""];
return [string isEqualToString:filter];
}
字符串截取
- [str substringWithRange:NSMakeRange(m,n)] 从第m个开始截取n个
- [str substringToIndex:n] 截取到第n个(n不在截取内)
- [str substringFromIndex:n] 从第n个截取到末尾(包含n)
富文本NSMutableAttributedString
富文本属性
NSFontAttributeName : 字体,默认字体Helvetica(Neue) /字号12
NSForegroundColorAttributeNam : 字体颜色,取值为UIColor对象,默认黑色
NSBackgroundColorAttributeName : 字体区域背景色,取值为UIColor对象,默认nil,透明色
NSLigatureAttributeName : 连体属性,取值为NSNumber对象(整数),0没有连体字符,默认1连体字符
NSKernAttributeName : 字符间距,取值为NSNumber 对象(整数),正值间距加宽,负值变窄
NSStrikethroughStyleAttributeName : 删除线,取值为 NSNumber 对象(整数)
NSStrikethroughColorAttributeName : 删除线颜色,取值为UIColor对象,默认黑色
NSUnderlineStyleAttributeName : 下划线,取值为枚举NSUnderlineStyle中的值,与删除线类似
NSUnderlineColorAttributeName : 下划线颜色,取值为UIColor 对象,默认黑色
NSStrokeWidthAttributeName : 笔画宽度,取值为NSNumber 对象(整数),负值填充效果,正值中空效果
NSStrokeColorAttributeName : 填充部分颜色,不是字体颜色,取值为UIColor 对象
NSShadowAttributeName : 阴影属性,取值为NSShadow对象
NSTextEffectAttributeName : 文本特殊效果,取值为NSString对象,目前只有图版印刷效果可用：
NSBaselineOffsetAttributeName : 基线偏移值,取值为NSNumber(float),正值上偏,负值下偏
NSObliquenessAttributeName : 字形倾斜度,取值为NSNumber(float）,正值右倾,负值左倾
NSExpansionAttributeName : 文本横向拉伸属性,取值为NSNumber(float),正值横向拉伸文本，负值横向压缩文本
NSWritingDirectionAttributeName : 文字书写方向,从左向右书写或者从右向左书写
NSVerticalGlyphFormAttributeName : 文字排版方向,取值为NSNumber对象(整数),0表示横排文本,1表示竖排文本
NSLinkAttributeName : 链接属性,点击后调用浏览器打开指定URL地址
NSAttachmentAttributeName : 文本附件,取值为NSTextAttachment对象,常用于文字图片混排
NSParagraphStyleAttributeName : 文本段落排版格式,取值为NSParagraphStyle对象
NSMutableAttributedString *attStr = [[NSMutableAttributedString alloc] initWithString:str];
//格式调整
NSMutableParagraphStyle *style = [[NSMutableParagraphStyle alloc] init];
/**调行间距*/
style.lineSpacing = 10;
//字间距
[attStr addAttribute:NSKernAttributeName value:@5 range:NSMakeRange(0, [str length])];
//添加行间距
[attStr addAttribute:NSParagraphStyleAttributeName value:style range:NSMakeRange(0, [str length])];
//横竖排版 ---无效果
// [attStr addAttribute:NSVerticalGlyphFormAttributeName value:@1 range:NSMakeRange(0, [str length])];
//下画线
[attStr addAttribute:NSUnderlineStyleAttributeName value:@1 range:NSMakeRange(0, [str length])];
//边线宽度
[attStr addAttribute:NSStrokeWidthAttributeName value:@1 range:NSMakeRange(10, 10)];
//边线颜色
[attStr addAttribute:NSStrokeColorAttributeName value:[UIColor redColor] range:NSMakeRange(10, 10)];
//阴影--无效果
[attStr addAttribute:NSShadowAttributeName value:@4 range:NSMakeRange(20, 10)];
//下划线
[attStr addAttribute:NSStrikethroughStyleAttributeName value:@2 range:NSMakeRange(20, 10)];
[attStr addAttribute:NSStrikethroughColorAttributeName value:[UIColor redColor] range:NSMakeRange(20, 10)];
//字体背影色
[attStr addAttribute:NSBackgroundColorAttributeName value:[UIColor blueColor] range:NSMakeRange(45, 10)];
//字体颜色
[attStr addAttribute:NSForegroundColorAttributeName value:[UIColor orangeColor] range:NSMakeRange(60, 10)];
//段落
[attStr addAttribute:NSParagraphStyleAttributeName value:@6 range:NSMakeRange(70, 80)];
详见1
详见2
富文本计算高度
#pragma mark 文字高度
- (CGFloat)textH:(NSString *)text lineSpace:(CGFloat)lineSpace width:(CGFloat)width font:(UIFont *)font
{
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc]init];
paragraphStyle.lineSpacing = lineSpace;
NSDictionary *attributes = @{NSParagraphStyleAttributeName:paragraphStyle,NSFontAttributeName:font};
CGSize size = [text boundingRectWithSize:CGSizeMake(width, MAXFLOAT)
options:NSStringDrawingUsesLineFragmentOrigin
attributes:attributes
context:nil].size;
return size.height;
}
改变子串颜色
+ (__kindof NSMutableAttributedString *_Nonnull)changeTotalString:(NSString *_Nonnull)totalString subStringArray:(NSArray *_Nonnull)subStringArray subStringColor:(UIColor *_Nonnull)color andFont:(UIFont *_Nonnull)font {
NSMutableAttributedString *attributedStr = [[NSMutableAttributedString alloc] initWithString:totalString];
for (NSString *rangeStr in subStringArray) {
NSRange range = [totalString rangeOfString:rangeStr options:NSBackwardsSearch];
[attributedStr addAttribute:NSForegroundColorAttributeName value:color range:range];
[attributedStr addAttribute:NSFontAttributeName value:font range:range];
}
return attributedStr;
}
字符串中添加图片
- (NSAttributedString *)stringWithUIImage:(NSString *) contentStr {
// 创建一个富文本
NSMutableAttributedString * attriStr = [[NSMutableAttributedString alloc] initWithString:contentStr];
// 修改富文本中的不同文字的样式
[attriStr addAttribute:NSForegroundColorAttributeName value:[UIColor blueColor] range:NSMakeRange(0, 5)];
[attriStr addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:20] range:NSMakeRange(0, 5)];
/**
添加图片到指定的位置
*/
NSTextAttachment *attchImage = [[NSTextAttachment alloc] init];
// 表情图片
attchImage.image = [UIImage imageNamed:@"jiedu"];
// 设置图片大小
attchImage.bounds = CGRectMake(0, 0, 40, 15);
NSAttributedString *stringImage = [NSAttributedString attributedStringWithAttachment:attchImage];
[attriStr insertAttributedString:stringImage atIndex:2];
// 设置数字为红色
/*
[attriStr addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(5, 9)];
[attriStr addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:30] range:NSMakeRange(5, 9)];
*/
//NSDictionary * attrDict = @{ NSFontAttributeName: [UIFont fontWithName: @"Zapfino" size: 15],
// NSForegroundColorAttributeName: [UIColor blueColor] };
//创建 NSAttributedString 并赋值
//_label02.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict];
NSDictionary * attriBute = @{NSForegroundColorAttributeName:[UIColor redColor],NSFontAttributeName:[UIFont systemFontOfSize:30]};
[attriStr addAttributes:attriBute range:NSMakeRange(5, 9)];
// 添加表情到最后一位
NSTextAttachment *attch = [[NSTextAttachment alloc] init];
// 表情图片
attch.image = [UIImage imageNamed:@"jiedu"];
// 设置图片大小
attch.bounds = CGRectMake(0, 0, 40, 15);
// 创建带有图片的富文本
NSAttributedString *string = [NSAttributedString attributedStringWithAttachment:attch];
[attriStr appendAttributedString:string];
return attriStr;
}
段落
// paragraph style
_style = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
_style.alignment = NSTextAlignmentLeft; //对齐
_style.headIndent = 0.0f;//行首缩进
_style.firstLineHeadIndent = 10.0f;//首行缩进
_style.tailIndent = 0.0f;//行尾缩进
_style.lineSpacing = 2.0f;//行间距
NSAttributedString *attrText = [[NSAttributedString alloc] initWithString:_text attributes:@{ NSParagraphStyleAttributeName : _style}];
UILabel *_content = [[UILabel alloc] init];
_content.attributedText = attrText;
URL中含中文的解决
// 方法1:
NSString* encodedString = [urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
// 方法2:
NSString * encodedString = (NSString *)CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,(CFStringRef)urlString,NULL,NULL,kCFStringEncodingUTF8);
如果URL含有已转义的%等符号时,会再次转义而导致错误.
查看方法2参数说明:
CFStringRef CFURLCreateStringByAddingPercentEscapes(CFAllocatorRef allocator,CFStringRef originalString, CFStringRef charactersToLeaveUnescaped, CFStringRef legalURLCharactersToBeEscaped,CFStringEncoding encoding);
因此做出修改,写出方法:
NSString *encodedString = (NSString *)CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)urlString, (CFStringRef)@"!$&'()*+,-./:;=?@_~%#[]", NULL, kCFStringEncodingUTF8);
.
富文本