UITextField 获取这在输入的内容：UITextField的父类为UIControl说以可以用一下方法获取
UITextField *textfield = [[UITextField alloc]init];;
[textfield addTarget:self action:@selector(updateLabel) forControlEvents:UIControlEventEditingChanged];
图片的拉伸
UIImage *img=[UIImage imageNamed:@"imag"];
img=[img stretchableImageWithLeftCapWidth:15 topCapHeight:12];
UIImageView *imgView=[[UIImageView alloc]initWithImage:img];
[imgView setFrame:CGRectMake(10, 10, 200, 200)];
[self. view addSubview
这里用的图片拉伸方法
- (UIImage *)stretchableImageWithLeftCapWidth:(NSInteger)leftCapWidth topCapHeight:(NSInteger)topCapHeight;
leftCapWidth是指leftCapWidth后面的一个想像素开始拉伸，topCapHeight距离topCapHeight的像素开始拉升
字体加粗
[UIFont boldSystemFontOfSize:15];