//設置圓角 
zheZhaoView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 120, 120)];
 [zheZhaoView setBackgroundColor:[UIColor colorWithWhite:0.3f alpha:0.8f]];
 zheZhaoView.layer.cornerRadius = 10;//設置那個圓角的有多圓
 zheZhaoView.layer.borderWidth = 0;//設置邊框的寬度，當然可以不要
 zheZhaoView.layer.borderColor = [[UIColor grayColor] CGColor];//設置邊框的顏色
 zheZhaoView.layer.masksToBounds = YES;
 [self addSubview:zheZhaoView];