Objective-C Fundamentals

108 CHAPTER 5 Creating classes
}
if (numberOfComplaints > 3) {
[self increaseRentalByPercent:15 withMaximum:400];
}
The handleComplaint method (something you might like to add as the Rental Property
application continues to grow) increases the numberOfComplaints instance variable
by 1. If a rental property has had more than three formal complaints, the method
also invokes the increaseRentalByPercent:withMaximum: method on the same
object, as indicated by the use of self as the target for the message.
5.3.4 Fleshing out the method file for the CTRentalProperty class
Using your newfound knowledge of how to implement methods, you’re ready to complete
the first revision of your CTRentalProperty class. Replace the contents of
CTRentalProperty.m with the code in the following listing.
Listing 5.2
Providing an initial implementation of the CTRentalProperty class
#import "CTRentalProperty.h"
@implementation CTRentalProperty
- (void)increaseRentalByPercent:(float)percent
withMaximum:(float)max {
}
rentalPrice = rentalPrice * (100 + percent) / 100;
rentalPrice = fmin(rentalPrice, max);
- (void)decreaseRentalByPercent:(float)percent
withMinimum:(float)min {
}
rentalPrice = rentalPrice * (100 - percent) / 100;
rentalPrice = fmax(rentalPrice, min);
- (void)setRentalPrice:(float)newRentalPrice {
rentalPrice = newRentalPrice;
}
- (float)rentalPrice {
return rentalPrice;
}
- (void)setAddress:(NSString *)newAddress {
[address autorelease];
address = [newAddress copy];
Make a
}
copy
- (NSString *)address {
return address;
}
d
b
c
Update instance
variable
Free previous
address
- (void)setPropertyType:(PropertyType)newPropertyType {
propertyType = newPropertyType;
}