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January 23, 2017 08:39
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NSAttributedString *attrString; // from previous code | |
NSDictionary *options = @{NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType}; | |
NSData *htmlData = [attrString dataFromRange:NSMakeRange(0, [attrString length]) documentAttributes:options error:nil]; | |
NSString *htmlString = [[NSString alloc] initWithData:htmlData encoding:NSUTF8StringEncoding]; |
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法一 | |
据说是开发文档中的方法,未考证。 | |
NSEnumerator *enumerator = [myDictionary keyEnumerator]; | |
id key; | |
while ((key = [enumerator nextObject])) { | |
/* code that uses the returned key */ | |
} | |
法二 | |
@未解提供,也是最方便用的最多的一种方法,一般用这种就可以。 | |
NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:@"value1", @"key1", @"value2", @"key2", nil]; | |
for (NSString *key in dict) { | |
NSLog(@"key: %@ value: %@", key, dict[key]); | |
} | |
法三 | |
这个方法是最笨拙的一个,一般遍历NSDictionary也不会这么用,姑且记在这里,怎么也算是一种方法嘛~ | |
- (void)describeDictionary:(NSDictionary *dict) | |
{ | |
NSArray *keys; | |
int i, count; | |
id key, value; | |
//获取字典中所有的Key | |
keys = [dict allKeys]; | |
count = [keys count]; | |
for (i = 0; i < count; i++) | |
{ | |
key = [keys objectAtIndex: i]; | |
value = [dict objectForKey: key]; | |
NSLog (@"Key: %@ for value: %@", key, value); | |
} | |
} | |
//方法4: | |
//得到词典中所有KEY值 | |
NSEnumerator * enumeratorKey = [dictionary keyEnumerator]; | |
//快速枚举遍历所有KEY的值 | |
for (NSObject *object in enumeratorKey) { | |
NSLog(@"遍历KEY的值: %@",object); | |
} | |
//得到词典中所有Value值 | |
NSEnumerator * enumeratorValue = [dictionary objectEnumerator]; | |
//快速枚举遍历所有Value的值 | |
for (NSObject *object in enumeratorValue) { | |
NSLog(@"遍历Value的值: %@",object); | |
} | |
方法5: | |
[dictionary enumerateObjectsUsingBlock:^(id obj, BOOL *stop) { | |
}]; |
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NSSet和NSMutableSet是无序的, 但是它保证数据的唯一性。当插入相同的数据时,不会有任何效果。从内部实现来说是hash表,所以可以常数时间内查找一个数据。 |
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NSAttributedString *attrString; // from previous code | |
NSDictionary *options = @{NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType}; | |
NSData *htmlData = [attrString dataFromRange:NSMakeRange(0, [attrString length]) | |
documentAttributes:options | |
error:nil]; | |
NSString *htmlString = [[NSString alloc] initWithData:htmlData | |
encoding:NSUTF8StringEncoding]; |
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