Objective-C 高级技巧（迭代更新）

1. 重载

黑魔法： attribute((overloadable))
<pre>
@interface ViewController ()

@end

NSString * attribute((overloadable)) mytest(NSString *x) {return @"aa";}
NSString * attribute((overloadable)) mytest(NSNumber *x) {return @"bb";}
NSString * attribute((overloadable)) mytest(NSDictionary *x) {return @"cc";}
NSString * attribute((overloadable)) mytest(int x) { return @"int"; }
NSString * attribute((overloadable)) mytest(double x) { return @"double"; }
NSString * attribute((overloadable)) mytest(long x) { return @"long"; }

@implementation ViewController

• (void)viewDidLoad {
  [super viewDidLoad];
  NSLog(@"%@", mytest(133333333));
  }
  @end
  </pre>