在IOS程序中设置UIButton的字体大小

[self.view?addSubview:m_topButtonChoose];

?

附：创建按钮的两种方法：

1、动态创建
btnfont = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[btnfont setFrame:CGRectMake(100, 10, 120, 40)];
[btnfont addTarget:self action:nil forControlEvents:UIControlEventTouchUpInside];
[btnfont setTitle:@"字体" forState:UIControlStateNormal];
btnfont.backgroundColor=[UIColor clearColor];
[self.view addSubview:btnfont];
2、在xib文件中已经创建好，通过tag获取按钮
UIButton *testButton= (UIButton*)[self.view viewWithTag:100];
[testButton addTarget:self action:@selector(test:) forControlEvents:UIControlEventTouchUpInside];

注册事件
-(void) test: (id) sender{

UIAlertView *av = [[[UIAlertView alloc] initWithTitle:@"ceshi" message:@"test11111" delegate:nil cancelButtonTitle:@"OK"otherButtonTitles:nil] autorelease];

[av show];

}