다정한 강아지

Item 47: Familiarize Yourself with the System Frameworks Item 48: Prefer Block Enumeration to for Loops - Fast Enumeration // Array NSArray *anArray = /* ... */; for (id object in anArray) { // Do something with 'object' } // Dictionary NSDictionary *aDictionary = /* ... */; for (id key in aDictionary) { id value = aDictionary[key]; // Do something with 'key' and 'value' } // Set NSSet *aSet = /..

Item 15: Use Prefix Names to Avoid Namespace Clashes Item 16: Have a Designated Initializer Item 17: Implement the description Method - (NSString*)description { return [NSString stringWithFormat:@"", [self class], self, _firstName, _lastName]; } If this were to be used, the output for an object of type EOCPerson would now look like the following: EOCPerson *person = [[EOCPerson alloc] initWithFi..

Item 6: Understand Properties 프로퍼티 속성 중 Memory-Management 관련된 속성인데 - assign : The setter is a simple assign operation used for scalar types, such as CGFloat or NSInteger. - strong : This designates that the property defines an owning relationship. When a new value is set, it is first retained, the old value is released, and then the value is set. - weak : This designates that the property define..

Item 1: Familiarize Yourself with Objective-C's Roots Item 2: Minimize Importing Headers in Headers When writing an import into a header file, always ask yourself whether it’s really necessary. If the import can be forward declared, prefer that. If the import is for something used in a property, instance variable, or protocol conformance and can be moved to the class-continuation category, prefe..

Objective-C 문법에서 왜 항상 변수 앞에 *로 선언하나 궁금했었는데.. NSString *someString = @"The string"; This syntax, mostly lifted straight from C, declares a variable called someString whose type is NSString*. This means that it is a pointer to an NSString. All Objective-C objects must be declared in this way because the memory for objects is always allocated in heap space and never on the stack. It is illegal to d..