实现的原理： 利用了自动布局和形变
核心代码块：
@implementation JHMainView
{
UILabel *label1,*label2,*label3,*label4;
UIButton *btn;
}
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
btn = [[UIButton alloc]initWithFrame:CGRectMake(100, 120, 120, 120)];
btn.transform = CGAffineTransformRotate(btn.transform, M_PI_4);
[btn addTarget:self action:@selector(btnClick:)forControlEvents:UIControlEventTouchUpInside];
btn.autoresizesSubviews = YES;
//btn.backgroundColor = [UIColor cyanColor];
label1 = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, 60, 60)];
label1.backgroundColor = [UIColor orangeColor];
label2 = [[UILabel alloc]initWithFrame:CGRectMake(btn.bounds.size.width/2, 0, 60, 60)];
label2.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin;
label2.backgroundColor = [UIColor blackColor];
label3 = [[UILabel alloc]initWithFrame:CGRectMake(0, btn.bounds.size.height/2, 60, 60)];
label3.backgroundColor = [UIColor blueColor];
label3.autoresizingMask = UIViewAutoresizingFlexibleTopMargin;
label4 = [[UILabel alloc]initWithFrame:CGRectMake(btn.bounds.size.width/2, btn.bounds.size.height/2, 60, 60)];
label4.autoresizingMask = UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleLeftMargin;
label4.backgroundColor = [UIColor purpleColor];
[btn addSubview:label1];
[btn addSubview:label2];
[btn addSubview:label3];
[btn addSubview:label4];
[self addSubview:btn];
}
return self;
}
- (void)btnClick:(UIButton *)sender
{
static int i=1 ;
btn.center = btn.center;
if(i%2)
{
btn.bounds = CGRectMake(0, 0, 180, 180);
}
else
{
btn.bounds = CGRectMake(0, 0, 120, 120);
}
i++;
}
@end