按钮小结1

    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    button.frame = CGRectMake(0, 0, 50, 50);
//    button.center = CGPointMake(CGRectGetMidX(self.view.bounds), CGRectGetMidY(self.view.bounds));
    [button setTitle:@"转换转换转换" forState:UIControlStateNormal];
    [button setBackgroundColor:[UIColor whiteColor]];
    [button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    [button addTarget:self action:@selector(turnToAnotherController:) forControlEvents:UIControlEventTouchDown];
    [self.view addSubview:button];