IOS Note - Core NS Data Types

NSString (Immutable)
NSMutableString (rarely used)
NSNumber
NSValue
NSData (bits)
NSDate
NSArray (Immutable)
- once you create the array, you cannot add or remove objects
eg:
NSArray *primaryColors = [NSArray arayWithObjects:@"red", @"yellow", @"blue", nil];
NSMutableArray

NSDictionary
NSDictionary *base = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNUmber numberWithInt:2], @"binary",
[NSNUmber numberWIthInt:16], #hexadecimal", nil];
- (int)count;
- (id)objectForKey:(id)key;
- (NSArray *)allKeys;
- (NSArray *)allValues;

NSMutableDictionary
NSSet
NSMutableSet
NSOrderedSet
NSMutableOrderedSet

-----------------------------------------------------------------------------------------------------------

Enumeration

NSArray

NSArray *myArray = ...;

for (NSString *str in myArray) {

    if ([str isKindOfClass:[NSString class]]) {

        double value = [str doubleValue];

    }

}

NSSet

NSSet *mySet = ...;

for (id obj in mySet) {

    if ([obj isKindOfClass:[NSString class]]) {

        // send NSString messages to obj

    }

}

NSDictionary

NSDictionary *myDict = ...;

for (id key in myDict) {

    id value = [myDict objectForKey:key];

}

巴特西

IOS Note - Core NS Data Types

最新文章

热门文章