【ios 汇总 - 数据 容器】

 遍历字典

NSLog(@"***遍历字典myClassDict如下：");
for (id key in myClassDict)
{
NSLog(@"key: %@ ,value: %@",key,[myClassDict objectForKey:key]);
}


[_surveyAnswers1 setObject:myArrayAnswers1 forKey:@"FirstKey"];

for (NSString *key in [cacheDict allKeys]) {}

快速创建array 

//NSMutableArray *array = [NSMutableArray arrayWithObjects:  @"One",@"Two",@"Three",nil]; 

[_list addObjectsFromArray:[indexlist copy]];
_filteredList = [_stringList filteredArrayUsingPredicate:[NSPredicatepredicateWithFormat:@"SELF contains[cd] %@", searchString]];

从plist 导入array

NSString *path = [[NSBundlemainBundle] pathForResource:@"CmdStrList"ofType:@"plist"];
        _cmdlist = [[NSArrayalloc] initWithContentsOfFile:path];

/*-------------数组枚举---------------*/      
//- (NSEnumerator *)objectEnumerator;从前向后  
//NSMutableArray *array = [NSMutableArray arrayWithObjects:  
@"One",@"Two",@"Three",nil];  
NSEnumerator *enumerator;  
enumerator = [array objectEnumerator];  
  
id thingie;  
while (thingie = [enumerator nextObject]) {  
    NSLog(@"thingie:%@",thingie);  
}  
  
//- (NSEnumerator *)reverseObjectEnumerator;从后向前  
//NSMutableArray *array = [NSMutableArray arrayWithObjects:  
@"One",@"Two",@"Three",nil];  
NSEnumerator *enumerator;  
enumerator = [array reverseObjectEnumerator];  
  
id object;  
while (object = [enumerator nextObject]) {  
    NSLog(@"object:%@",object);  
}  

1）componentsSeparatedByString:截取指定字符串；

2) pathForResource：获取程序运行时目录

3)  objectAtIndex:获取当前索引的字符串；

4)  rangeOfString:获取指定短字符串在长字符串中的开始，结尾索引值；

5) stringWithContentsOfFile：按行读取文件

6) componentsSeparatedByString:@" "];换行分割字符串；

7) NSEnumerator *nse = [lines objectEnumerator]; 将数组转换为NSEnumerator，可向前读取数据；

8)  nextObject：读取下一行数据；

 

void splitString(){

NSString *animals = @"dog#cat#pig";

//将#分隔的字符串转换成数组

NSArray *array = [animals componentsSeparatedByString:@"#"];

NSLog(@"animals:%@",array);

//获取程序运行时目录

NSString *escapedPath = [[NSBundle mainBundle] pathForResource:@"info" ofType:@"plist"];

NSArray *strings = [escapedPath componentsSeparatedByString: @"/"];

NSString *tmpFilename  = [strings objectAtIndex:[strings count]-1];

NSRange iStart = [escapedPath rangeOfString : tmpFilename];

NSString *runtimeDirectory = [escapedPath substringToIndex:iStart.location-1];

NSLog(@"runtimeDirectory:%@",runtimeDirectory);

//按行读取文件

NSString *tmp;

NSArray *lines = [[NSString stringWithContentsOfFile:@"test.txt" encoding:nil error:nil] 

  componentsSeparatedByString:@" "];

NSEnumerator *nse = [lines objectEnumerator];

while(tmp = [nse nextObject]) {

NSLog(@"tmp:%@", tmp);

}

}

  rang.location 指向的是 @"//" 的头一个字符
    NSRange range;
    range = [url rangeOfString:@"//"];
    if (range.length > 0) {
        url = [url substringFromIndex:range.location + range.length];
    }
从 // 之后截取     range = [url rangeOfString:@"/"];
    if (range.length > 0) {
        url = [url substringFromIndex:range.location + 1];
    }
截取到 # ，不包含#
    range = [url rangeOfString:@"#"];
    if (range.length > 0 && range.location > 0) {
        url = [url substringToIndex:range.location];
    }


modulename = [NSStringstringWithUTF8String:(*itStr).c_str()];
NSString* welcomeInfo =[@"欢迎回来 "stringByAppendingString:nickName]; NSString *servantCmd = [NSString stringWithFormat:@"wnsxms.%@",@"getcommandlist"];