我有这个是viewDidLoad://SetupregisterbuttonUIButton*registerButton=[UIButtonbuttonWithType:UIButtonTypeSystem];[registerButtonsetTitle:@"Register"forState:UIControlStateNormal];registerButton.frame=CGRectMake(0.0,0.0,self.screenWidth/2.0,100.0);还有这个:-(IBAction)buttonPressed:(UIButton*)sender{}我的.h文件中