图片滤镜功能的代码设计

- (void)viewDidLoad{    [super viewDidLoad];    UIButton *leftBtn = [UIButton buttonWithType:UIButtonTypeCustom];    [leftBtn setImage:[UIImage imageNamed:@"btn_back.png"] forState:UIControlStateNormal];    [leftBtn setFrame:CGRectMake(10, 20, 34, 34)];    [leftBtn addTarget:self action:@selector(backView:) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:leftBtn];        UIButton *rightBtn =[UIButton buttonWithType:UIButtonTypeCustom];    [rightBtn setImage:[UIImage imageNamed:@"camera_btn_ok.png"] forState:UIControlStateNormal];    [rightBtn setFrame:CGRectMake(270, 20, 34, 34)];    [rightBtn addTarget:self action:@selector(fitlerDone:) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:rightBtn];        [self.view setBackgroundColor:[UIColor colorWithWhite:0.388 alpha:1.000]];    rootImageView = [[UIImageView alloc ] initWithFrame:CGRectMake(40, 70, 230, 300)];    rootImageView.image = currentImage;    [self.view addSubview:rootImageView];    //用字符串数组声明所有的滤镜效果    NSArray *arr =[NSArray arrayWithObjects:@"原创美图",@"奇幻世界",@"亮彩风光",@"黑白心情",@"怀旧时刻",@"碧绿清静",nil];      scrollerView = [[UIScrollView alloc]initWithFrame:CGRectMake(0, ScreenHeight - 80, 320, 80)];    scrollerView.backgroundColor = [UIColor clearColor];    scrollerView.indicatorStyle = UIScrollViewIndicatorStyleBlack;    scrollerView.showsHorizontalScrollIndicator = NO;    //关闭纵向滚动条    scrollerView.showsVerticalScrollIndicator = NO;    scrollerView.bounces = NO;    //循环每一次选择的滤镜    float x ;    for(int i=0;i<6;i++)    {        x = 10 + 51*i;        UITapGestureRecognizer *recognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(setImageStyle:)];        recognizer.numberOfTouchesRequired = 1;        recognizer.numberOfTapsRequired = 1;        recognizer.delegate = self;                UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(x, 53, 40, 23)];        [label setBackgroundColor:[UIColor clearColor]];        [label setText:[arr objectAtIndex:i]];        [label setTextAlignment:NSTextAlignmentCenter];        [label setFont:[UIFont systemFontOfSize:13.0f]];        [label setTextColor:[UIColor whiteColor]];        [label setUserInteractionEnabled:YES];        [label setTag:i];        [label addGestureRecognizer:recognizer];                [scrollerView addSubview:label];        [label release];                UIImageView *bgImageView = [[UIImageView alloc]initWithFrame:CGRectMake(x, 10, 40, 43)];        [bgImageView setTag:i];        [bgImageView addGestureRecognizer:recognizer];        [bgImageView setUserInteractionEnabled:YES];        UIImage *bgImage = [self changeImage:i imageView:nil];        bgImageView.image = bgImage;        [scrollerView addSubview:bgImageView];        [bgImageView release];                [recognizer release];    }    //把最终选择的滤镜填充到主界面中    scrollerView.contentSize = CGSizeMake(x + 55, 80);    [self.view addSubview:scrollerView];    }