点击按钮修改文本尺寸

目前正在开发iphone应用，需要实现通过点击一个按钮，修改标签中的文本尺寸，不知道这种功能应该怎么实现？应该是在ios5中开发的。谢谢指教~~

创建UILabel

self.lbl=[[UILabel alloc] initWithFrame:CGRectMake(135, 290,200,35)];
    self.lbl.backgroundColor=[UIColor clearColor];
    NSString *str=[NSString stringWithFormat:@"%.f",[self.slider value]];
    [self.lbl setFont:[UIFont fontWithName:@"Arial-BoldMT" size:16]];
    self.lbl.text=str;
    [self.View addSubview:self.lbl];

点击UIButton时修改UILabel文本尺寸

-(IBAction)ButtonPressed:(id)sender
{
    [self.lbl setFont:[UIFont fontWithName:@"Arial-BoldMT" size:25]];
}

应该可以实现你想要的效果 :)

 CGRect frame = CGRectMake(0, 0, 400, 44);
 UILabel *label = [[[UILabel alloc] initWithFrame:frame] autorelease];
 label.backgroundColor = [UIColor clearColor];
 label.font = [UIFont boldSystemFontOfSize:8.0];
 label.textAlignment = UITextAlignmentCenter;
 label.textColor = [UIColor whiteColor];
 label.text = @"Sample custom Title With small Fonts ";
 self.navigationItem.titleView = label;

试试这个

-(IBAction)changeFontOfLabel:(id)sender
{
   [self.lebelObject setFont:[UIFont fontWithName:@"American Typewriter" size:18];
}

还有：注意写对字体名字。