ObjC第六節 2 OC常用類

oc常用類:nsarray、nsdictionary、nsdata

1、nsarray

2、nsdictionary

3、nsdata

nsarray

nsarray

#import #import "classa.h"
#import "classb.h"
int main(int argc, const char * argv)

nsarray（普通的陣列排序）

#import int main(int argc, const char * argv)
for (id object in arr)
nsarray * arr1 = [nsarray arraywithobjects:str1, str2, @"11", nil];
nsarray * arr2 = [arr1 sortedarrayusingselector:@selector(compare:)];
nslog(@"%@", arr2);
return 0;
}

nsarray 陣列排序之自寫compareperson

#import #import "classa.h"
int main(int argc, const char * argv)
;nscomperator comparestringsblock = ^(id stringa, id stringb) ;
nsarray *array = [nsarray arraywithobjects:a1, a2, a3, a4, nil];
nsarray *sortedarray = [array sortedarrayusingcomparator:^nscomparisonresult(id obj1, id obj2)];
nslog(@"%@",sortedarray);
這裡的**可以參照上面compare:預設的排序方法，也可以把自定義的方法寫在這裡，給物件排序
[a4 release];
return 0;
}

#import @inte***ce classa : nsobject

@property (nonatomic) int x, y;
- (void) print;
#pragma mark --自寫compare
@property (nonatomic)int age;
@property (nonatomic, retain) nsstring * name;
+(id)personwithage:(int) age withname:(nsstring *)name;
-(id)initwithage:(int) age withname:(nsstring *)name;
-(nscomparisonresult)compareperson:(classa *)person;
-(nsstring *) description;
@end

#import "classa.h"

@implementation classa
@synthesize x, y;
- (void) print
#pragma mark --自寫compareperson
@synthesize age, name;
+(id)personwithage:(int) age withname:(nsstring *)name
-(id)initwithage:(int)_age withname:(nsstring *)_name;
return self;
}-(nscomparisonresult)compareperson:(classa *)person
return result;
}-(nsstring *) description
@end

nsarray 陣列排序之高階排序（組合類的排序，排序描述器sortedarrayusingdescriptors:）

#import #import "person.h"
int main(int argc, const char * argv)

#import @inte***ce car : nsobject

@property (nonatomic, retain) nsstring * color;
+(car *)carwithcolor:(nsstring *)_color;
@end
#import "car.h"
@implementation car
@synthesize color;
+(car *)carwithcolor:(nsstring *)_color
@end

#import #import "car.h"

@inte***ce person : nsobject
@property (nonatomic)int age;
@property (nonatomic, retain) nsstring * name;
@property (nonatomic, retain) car * car;
+(id)personwithage:(int) age withname:(nsstring *)name withcar:(car *)car;
-(nsstring *) description;
@end
#import "person.h"
@implementation person
@synthesize age, name, car;
+(id)personwithage:(int) age withname:(nsstring *)name withcar:(car *)car
-(nsstring *) description
@end

nsarray

#import int main ()
for (id obj in arr)
return 0;
}

nsmutablearray

#import int main ()

nsdictionary

//nsdictionary

nsdictionary的空值

#import int main(int argc, const char * argv)

else
return 0;
}

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