iOS 成员变量和属性的关系
#import
//Public: is available an accessible from anywhere
//Protected: is available only to subclasses
//Private: is available to the class only
//Package: is available from that package only aka Framework or Library
@interface ViewController : UIViewController {
//成员变量
//如果一个变量是public，我觉得不需要写在这里，直接写成property就可以，因为写成property，会自动生成一个 _ + 属性名的成员变量
// 例如，如果有一个属性是 propertyName，则会生成成员变量_propertyName，如果此处有_propertyName，则不生成
// @public
// NSString *_publicString;
@protected
NSString *protectedString;
// @private
// NSString* privateString;
// @package
// BOOL packageVar;
}
//属性变量
@property(nonatomic, copy) NSString *propertyString;
@property(nonatomic, copy) NSString *publicString;
@property(nonatomic, copy) NSString *foo;
@end
#import "ViewController.h"
@interface ViewController ()
//如果自己内部需要setter和getter来实现一些东西，就在.m文件的类目里用property来声明
//写在这里的property不会生成成员变量
@property(nonatomic, strong) UIButton *loginButton;
@end
@implementation ViewController {
//私有变量一般写在这里
@private
NSString* privateString;
}
@synthesize foo;
//@dynamic foo;
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
// privateString = @"私有变量";
//
// NSLog(@"%@", privateString);
}
- (void)setLoginButton:(UIButton *)loginButton {
self.loginButton = loginButton;
}
- (UIButton *)loginButton {
return self.loginButton;
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
ViewController *newViewController = [[ViewController alloc] init];
newViewController.propertyString = @"这是属性字符串";
unsigned int count = 0; //count记录变量的数量
// 获取类的所有成员变量
Ivar *members = class_copyIvarList([ViewController class], &count);
for (int i = 0; i < count; i++) {
Ivar ivar = members[i];
// 取得变量名并转成字符串类型
const char *memberName = ivar_getName(ivar);
NSLog(@"变量名 = %s",memberName);
}
// 获取类的所有成员属性
objc_property_t *properties =class_copyPropertyList([ViewController class], &count);
for (int i = 0; i
{
objc_property_t property = properties[i];
const char* char_f =property_getName(property);
NSString *propertyName = [NSString stringWithUTF8String:char_f];
NSLog(@"属性名 = %@",propertyName);
}
return YES;
}