设置uibutton 中文字大小和位置

 UIButton* button=[UIButton buttonWithType:UIButtonTypeCustom];

       button.frame=CGRectMake(5, 8, 50, 29);

        [button setBackgroundColor:[UIColor clearColor]];

        [button setBackgroundImage:[UIImage imageNamed:@"button_back.png"] forState:UIControlStateNormal];

        [button setBackgroundImage:[UIImage imageNamed:@"button_back_2.png"] forState:UIControlStateHighlighted];

        [button setTitle:@"返回" forState:UIControlStateNormal];

 

        button.titleEdgeInsets =UIEdgeInsetsMake(1, 5, 0, 0);    // 4个参数分别是距离上，左，下，右的数据

        button.titleLabel.font=[UIFont fontWithName:@"Helvetica-Bold" size:14];