NSRange(location, length):
eg:
NSRange r1 = {2,5}; NSRange r2 = {.location=2, .length=5}; NSRange r3 = NSMakeRange(2,5);//開發用 NSRange r4 = [@"hello kitty", rangeOfString:@"kit"];//r4={6,3} NSRange r5 = [@"hello kitty", rangeOfString:@"java"];//r5={NSNotFound,0}
ps: NSNotFound == -1;
NSString:它的實例可以包含任意的Unicode字符
eg:
NSString *name = @"大老虎";
方法:
- (NSUInteger)length;
- (BOOL)isEqualToString:(NSString *)other;
- (NSString *)uppercaseString;
- (NSRange)rangeOfString:(NSString *)aString
NSArray:
方法:
- (NSUInteger)count;
for循環array用到它,並且可以在循環中添加或刪除數組對象;在fast enumeration中會自動計算總數,但是不能有添加和刪除操作:
for (type *object in collection) { statements }