Data commit

Task/Break-OO-privacy/Objective-C/break-oo-privacy-1.m

@@ -0,0 +1,36 @@
+#import <Foundation/Foundation.h>
+
+@interface Example : NSObject {
+@private
+  NSString *_name;
+}
+- (instancetype)initWithName:(NSString *)name;
+@end
+
+@implementation Example
+- (NSString *)description {
+  return [NSString stringWithFormat:@"Hello, I am %@", _name];
+}
+- (instancetype)initWithName:(NSString *)name {
+  if ((self = [super init])) {
+    _name = [name copy];
+  }
+  return self;
+}
+@end
+
+int main (int argc, const char * argv[]) {
+  @autoreleasepool{
+
+    Example *foo = [[Example alloc] initWithName:@"Eric"];
+
+    // get private field
+    NSLog(@"%@", [foo valueForKey:@"name"]);
+
+    // set private field
+    [foo setValue:@"Edith" forKey:@"name"];
+    NSLog(@"%@", foo);
+
+  }
+  return 0;
+}

Task/Break-OO-privacy/Objective-C/break-oo-privacy-2.m

@@ -0,0 +1,50 @@
+#import <Foundation/Foundation.h>
+
+@interface Example : NSObject {
+@private
+  NSString *_name;
+}
+- (instancetype)initWithName:(NSString *)name;
+@end
+
+@implementation Example
+- (NSString *)description {
+  return [NSString stringWithFormat:@"Hello, I am %@", _name];
+}
+- (instancetype)initWithName:(NSString *)name {
+  if ((self = [super init])) {
+    _name = [name copy];
+  }
+  return self;
+}
+@end
+
+@interface Example (HackName)
+- (NSString *)getName;
+- (void)setNameTo:(NSString *)newName;
+@end
+
+@implementation Example (HackName)
+- (NSString *)getName {
+  return _name;
+}
+- (void)setNameTo:(NSString *)newName {
+  _name = [newName copy];
+}
+@end
+
+int main (int argc, const char * argv[]) {
+  @autoreleasepool{
+
+    Example *foo = [[Example alloc] initWithName:@"Eric"];
+
+    // get private field
+    NSLog(@"%@", [foo getName]);
+
+    // set private field
+    [foo setNameTo:@"Edith"];
+    NSLog(@"%@", foo);
+
+  }
+  return 0;
+}

Task/Break-OO-privacy/Objective-C/break-oo-privacy-3.m

@@ -0,0 +1,38 @@
+#import <Foundation/Foundation.h>
+#import <objc/runtime.h>
+
+@interface Example : NSObject {
+@private
+  NSString *_name;
+}
+- (instancetype)initWithName:(NSString *)name;
+@end
+
+@implementation Example
+- (NSString *)description {
+  return [NSString stringWithFormat:@"Hello, I am %@", _name];
+}
+- (instancetype)initWithName:(NSString *)name {
+  if ((self = [super init])) {
+    _name = [name copy];
+  }
+  return self;
+}
+@end
+
+int main (int argc, const char * argv[]) {
+  @autoreleasepool{
+
+    Example *foo = [[Example alloc] initWithName:@"Eric"];
+
+    // get private field
+    Ivar nameField = class_getInstanceVariable([foo class], "_name");
+    NSLog(@"%@", object_getIvar(foo, nameField));
+
+    // set private field
+    object_setIvar(foo, nameField, @"Edith");
+    NSLog(@"%@", foo);
+
+  }
+  return 0;
+}