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