类比UIButton的创建，创建按钮时:
UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];复制代码
按钮类型枚举:
typedef NS_ENUM(NSInteger, UIButtonType) { UIButtonTypeCustom = 0, // no button type UIButtonTypeSystem NS_ENUM_AVAILABLE_IOS(7_0), // standard system button UIButtonTypeDetailDisclosure, UIButtonTypeInfoLight, UIButtonTypeInfoDark, UIButtonTypeContactAdd, UIButtonTypeRoundedRect = UIButtonTypeSystem, // Deprecated, use UIButtonTypeSystem instead };复制代码 我们来类比UIButton
Test:
#importtypedef NS_ENUM(NSUInteger, CaiTestType) { TestTypeOne, TestTypeTwo, TestTypeThree};@interface Test : NSObject+ (Test *)createTest:(CaiTestType)type;- (void)doSomething;@end#import "Test.h"#import "TestOne.h"#import "TestTwo.h"#import "TestThree.h"@implementation Test+ (Test *)createTest:(CaiTestType)type{ switch (type) { case TestTypeOne: return [TestOne new]; break; case TestTypeTwo: return [TestTwo new]; break; case TestTypeThree: return [TestThree new]; break; default: break; }}- (void)doSomething{ //子类实现}@end复制代码
TestOne TestTwo TestThree
#import "TestOne.h"@implementation TestOne- (void)doSomething{ NSLog(@"---TestOne doSomething");}@end#import "TestTwo.h"@implementation TestTwo- (void)doSomething{ NSLog(@"---TestTwo doSomething");}@end#import "TestThree.h"@implementation TestThree- (void)doSomething{ NSLog(@"---TestThree doSomething");}@end复制代码 ViewController
#import "ViewController.h"#import "Test.h"@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. self.view.backgroundColor = [UIColor orangeColor]; Test *testOne = [Test createTest:TestTypeOne]; [testOne doSomething]; Test *testTwo = [Test createTest:TestTypeTwo]; [testTwo doSomething]; Test *testThree = [Test createTest:TestTypeThree]; [testThree doSomething]; Test *test = [Test createTest:TestTypeThree]; [test doSomething];}@end复制代码 打印结果:
2017-04-07 15:01:39.293 Test[58960:2605033] ---TestOne doSomething2017-04-07 15:01:39.293 Test[58960:2605033] ---TestTwo doSomething2017-04-07 15:01:39.293 Test[58960:2605033] ---TestThree doSomething2017-04-07 15:01:39.294 Test[58960:2605033] ---TestThree doSomething复制代码