【GeekBand】Week2. 필기 정리

1. 【OC/2-1】 문자열 처리

NSString *str = @"Hello World!";
NSString *str = [[NSString alloc]initWithCString:"Hello World!"
                                          encoding:NSUTF8StringEncoding];
NSString *str = [NSString stringWithCString:"Hello World!"
                                     encoding:NSUTF8StringEncoding];
NSMutableString *mustr = [NSMutableString stringWithCapacity:100];

str.length
[str length]

str1 isEqualToString: str2 // 【 】 
str1 == str2 //【 】 ，【 】 

[str characterAtIndex: i]

str = str.uppercaseString; // 
str = str.lowercaseString; // 
str = str.capitalizedString; // 

/**********
typedef struct _NSRange {  
      unsigned int location; // 
      unsigned int length; // 
}NSRange;
**********/
if ([str1 rangeOfString:str].location != NSNotFound) {  
      // 
}
/*
NSRange range = [str1 rangeOfString:@"Hello"];
range.location
range.length
*/

substringToIndex // ， ， 
substringFromIndex // ， 
substringWithRange // NSRange ， ， 。

hasPrefix

NSString* format = [NSString stringWithFormat: @"[%d, %d]", 100, 200];

[mustr3 appendString:@"Hello Objective"];
[mustr3 insertString:@"-C" atIndex:mustr3.length];
[mustr3 setString:@"Hi Objective"];
NSRange replaceRange = NSMakeRange(0, 2);
[mustr3 replaceCharactersInRange:replaceRange withString:@"Hello"];
NSRange deleteRange = NSMakeRange(5, 10);
[mustr3 deleteCharactersInRange:deleteRange];

2.【OC/2-2】집합 유형

NSArray & NSMutableArray

NSArray *array = [NSArray arrayWithObjects:@"Shanghai",@"Beijing", nil];
NSArray *array = [[NSArray alloc] initWithObjects:@"Shanghai",@"Beijing", nil];
NSArray *array = @[@"Shanghai",@"Beijing"];
NSMutableArray *muArray=[NSMutableArray arrayWithObjects:p1,p2,p3,p4, nil];
//nil 

array.count

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

/* ， NSNumber NSInteger */
NSNumber *numberObject1=[NSNumber numberWithInteger:300];
NSNumber *numberObject2=@300u;// 
/* NSValue struct */
Point point;
point.h=100;
point.v=200;
NSValue *pointObject=[NSValue value:&point withObjCType:@encode(Point)];
/* nil*/
NSNull* nullValue=[NSNull null];

for (    in array)

-(NSUInteger)indexOfObject:(id)anObject; // （isEqual）
-(NSUInteger)indexOfObjectIdenticalTo:(id)anObject; // 

NSArray* sortArray = [array sortedArrayUsingSelector:@selector(compare:)];

[muArray addObject:p];
[muArray removeObjectAtIndex:2];
[muArray insertObject:p atIndex:1];
muArray1[0]=p;

NSSet & NSMutableSet

NSDictionary & NSMutableDictionary

NSDictionary *dictionary1 = @{
      @"Shanghai" : p1,
      @"Beijing" : p2,
      @"New York" : p3,
      @"Paris" : p4
};
NSMutableDictionary *dictionary2 = 
[NSMutableDictionary dictionaryWithObjectsAndKeys:
                                p1, @"Shanghai",
                                p2, @"Beijing",
                                p3, @"New York",
                                p4, @"Paris",
                                nil];

[dictionary1 objectForKey:@"Beijing"]
dictionary1[@"Shanghai"]

for(NSString* key in dictionary1) {
      id object=dictionary1[key];
      NSLog(@"key:%@, object:%@", key, object);
}

[dictionary2 setObject:p5 forKey:@"London"];
[dictionary2 removeObjectForKey:@"Shanghai"];

3. 【OC/2-3】ARC

4.【OC/2-4】유형계약: 협의

if ([obj conformsToProtocol:@protocol(AProtocol)]) {
      // 
}

5. 【OC/2-5】 카테고리 및 확장

카테고리

확장