UIButton实现背景拉伸,即图片两端不拉伸中间拉伸的办法有如下两种:
第一种方法很简单而且使用性更广。做法就是直接拉伸想要setBackgroundImage的image,代码如下:
- UIImage *image = [UIImage imageNamed:@"image.png"];
- image = [image stretchableImageWithLeftCapWidth:floorf(image.size.width/2) topCapHeight:floorf(image.size.height/2)];
设置了左端帽之后,rightCapWidth = image.size.width - (image.leftCapWidth + 1); 也就是说图片中间的一像素用来拉伸。垂直方向同上。设置之后无论把image放到什么控件中都可以自动拉伸了。
- UIImage *buttonImage = [UIImage imageNamed:@"contact.png"];
- buttonImage = [buttonImage stretchableImageWithLeftCapWidth:floorf(buttonImage.size.width/2) topCapHeight:floorf(buttonImage.size.height/2)];
- UIImage *buttonImageselected = [UIImage imageNamed:@"contactselected.png"];
- buttonImage = [buttonImage stretchableImageWithLeftCapWidth:floorf(buttonImage.size.width/2) topCapHeight:floorf(buttonImage.size.height/2)];
- UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
- button.frame = CGRectMake(0, 0, 240, 44);
- [button setBackgroundImage:buttonImage forState:UIControlStateNormal];
- [button setBackgroundImage:buttonImageselected forState:UIControlStateHighlighted];
- button.center = CGPointMake(160, 240);
- [button setTitle:@"button" forState:UIControlStateNormal];
- [button setTitle:@"buttonClick" forState:UIControlStateHighlighted];
- [self.view addSubview:button];
第二种方法是在UIButton中加入一个UIImageView,拉伸imageView,然后将button的背景设为clearColor等等。把imageView放入button中,并且sendToBack,得到效果。代码如下:
//刚才imageView拉伸的代码
- UIImageView *strechTest = [[UIImageyiView alloc] initWithImage:[UIImage imageNamed:@"contact.png"]];
- [strechTest setContentStretch:CGRectMake(0.5f, 0.5f, 0.f, 0.f)];
- CGRect frame = strechTest.frame;
- frame.size.width += 100;
- strechTest.frame = frame;
- //把imageView放入button中,并设置为back
- UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
- button1.frame = frame;
- button1.center = CGPointMake(160, 140);
- [button1 addSubview:strechTest];
- [button1 sendSubviewToBack:strechTest];
- [button1 setBackgroundColor:[UIColor clearColor]];
- [button1 setTitle:@"button" forState:UIControlStateNormal];
- [button1 setTitle:@"buttonClick" forState:UIControlStateHighlighted];
- [self.view addSubview:button];
效果:
时间: 2024-10-29 02:11:36