NSAttributedString的用法
先上API
@interface NSAttributedString : NSObject <NSCopying, NSMutableCopying, NSCoding>
//把NSAttributedString转为字符串
- (NSString *)string;
//取到设置的属性字典
- (NSDictionary *)attributesAtIndex:(NSUInteger)location effectiveRange:(NSRangePointer)range;
//例子:
/-------------------------/
[attrString addAttribute:NSForegroundColorAttributeName
value:[UIColor redColor]
range:NSMakeRange(0, 2)];
NSRange range = NSMakeRange(0, 2);
NSDictionary*dic = [attrString attributesAtIndex:0 effectiveRange:&range];
//取到设置的属性字典
dic:
{
NSColor = "UIDeviceRGBColorSpace 1 0 0 1";
}
/-------------------------/
@end
@interface NSAttributedString (NSExtendedAttributedString)
//长度
- (NSUInteger)length;
//取到设置的属性的值
- (id)attribute:(NSString *)attrName atIndex:(NSUInteger)location effectiveRange:(NSRangePointer)range;
//根据range截取
- (NSAttributedString *)attributedSubstringFromRange:(NSRange)range;
- (NSDictionary *)attributesAtIndex:(NSUInteger)location longestEffectiveRange:(NSRangePointer)range inRange:(NSRange)rangeLimit;
- (id)attribute:(NSString *)attrName atIndex:(NSUInteger)location longestEffectiveRange:(NSRangePointer)range inRange:(NSRange)rangeLimit;
//判断两个string是否相同
- (BOOL)isEqualToAttributedString:(NSAttributedString *)other;
//初始化
- (id)initWithString:(NSString *)str;
- (id)initWithString:(NSString *)str attributes:(NSDictionary *)attrs;
- (id)initWithAttributedString:(NSAttributedString *)attrStr;
typedef NS_OPTIONS(NSUInteger, NSAttributedStringEnumerationOptions) {
NSAttributedStringEnumerationReverse = (1UL << 1),
NSAttributedStringEnumerationLongestEffectiveRangeNotRequired = (1UL << 20)
};
#if NS_BLOCKS_AVAILABLE
//遍历string
- (void)enumerateAttributesInRange:(NSRange)enumerationRange options:(NSAttributedStringEnumerationOptions)opts usingBlock:(void (^)(NSDictionary *attrs, NSRange range, BOOL *stop))block NS_AVAILABLE(10_6, 4_0);
- (void)enumerateAttribute:(NSString *)attrName inRange:(NSRange)enumerationRange options:(NSAttributedStringEnumerationOptions)opts usingBlock:(void (^)(id value, NSRange range, BOOL *stop))block NS_AVAILABLE(10_6, 4_0);
#endif
@end
NS_CLASS_AVAILABLE(10_0, 3_2)
@interface NSMutableAttributedString : NSAttributedString
//用str替换range内的AttributedString
- (void)replaceCharactersInRange:(NSRange)range withString:(NSString *)str;
- (void)setAttributes:(NSDictionary *)attrs range:(NSRange)range;
@end
@interface NSMutableAttributedString (NSExtendedMutableAttributedString)
- (NSMutableString *)mutableString;//初始化
//添加属性
- (void)addAttribute:(NSString *)name value:(id)value range:(NSRange)range;
- (void)addAttributes:(NSDictionary *)attrs range:(NSRange)range;
- (void)removeAttribute:(NSString *)name range:(NSRange)range;//删除属性
//替换
- (void)replaceCharactersInRange:(NSRange)range withAttributedString:(NSAttributedString *)attrString;
- (void)insertAttributedString:(NSAttributedString *)attrString atIndex:(NSUInteger)loc;//插入
- (void)appendAttributedString:(NSAttributedString *)attrString;//拼接string
- (void)deleteCharactersInRange:(NSRange)range;//删除
- (void)setAttributedString:(NSAttributedString *)attrString;//设置
- (void)beginEditing;//开始编辑
- (void)endEditing;//结束编辑
@end
基础用法
UILabel* label = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, 320, 200)];
label.font = [UIFont systemFontOfSize:20];
[self.view addSubview:label];
NSString* string = @"现金收/刷卡收,样样精通";
NSMutableAttributedString *attrString =
[[NSMutableAttributedString alloc] initWithString:string];
[attrString addAttribute:NSForegroundColorAttributeName
value:[UIColor redColor]
range:NSMakeRange(0, 2)];
[attrString addAttribute:NSFontAttributeName
value:[UIFont systemFontOfSize:14]
range:NSMakeRange(4, 2)];
label.attributedText = attrString;
