object-c 学习小记

leibie

申明

@interface NSString(NumberConvenience)

-(NSNumber *)lenthAsNumber;

@end

实现

@implementation NSString(NumberConvenience)

-(NSNumber *)lenthAsNumber{

unsigned int length = [self length];

return ([NSNumber numberWithUnsignedint : length]);

}

@end

正式协议

申明

@protocol myprotocol

-(id) someprotocol : (NSString *)zone;

@optional

-(void)method1;

@required

-(void)mthod2;

@end

采用

@interface myClass: NSOject<myprotocol, otherprotocol>

{

}

@end

特性

申明 @property(attributes) type name;

@interface myclass : someclass

{

int someproperty;

}

@property int someproperty;

@property float otherproperty;

@end

实现

@implementation myclass

@synthesize someproperty;

@synthesize property1 = otherproperty;

@end