iOS 抽獎輪盤效果實現思路

時間 2019-11-20

標籤 ios 抽獎輪盤效果實現思路欄目 iOS 简体版

原文原文鏈接

臨近活動，相信很多app都會加一個新的需求——抽獎很少廢話，先上GIF效果圖數組

Demo獲取請關注我私信「抽獎輪盤」就能夠領取！！！記住必定要私信app

跑馬燈效果

抽獎效果

實現步驟：dom

1、跑馬燈效果 oop

其實很簡單，就是經過如下兩張圖片，用NSTimer無限替換，達到跑馬燈的效果佈局

實現代碼：動畫

_rotaryTable = [[UIImageView alloc] initWithFrame:CGRectMake((kScreenWidth-366*XT)/2, 218*XT, 366*XT, 318*XT)];
_rotaryTable.tag = 100;
[_rotaryTable setImage:[UIImage imageNamed:@"bg_lamp_1"]];
[scrollView addSubview:_rotaryTable];

_itemBordeTImer = [NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:@selector(itemBordeTImerEvent) userInfo:nil repeats:YES];
[[NSRunLoop currentRunLoop] addTimer:_itemBordeTImer forMode:NSRunLoopCommonModes];

- (void)itemBordeTImerEvent
{
    if (_rotaryTable.tag == 100) {
        _rotaryTable.tag = 101;
        [_rotaryTable setImage:[UIImage imageNamed:@"bg_lamp_2"]];
    }else if (_rotaryTable.tag == 101){
        _rotaryTable.tag = 100;
        [_rotaryTable setImage:[UIImage imageNamed:@"bg_lamp_1"]];
    }
}

2、抽獎效果spa

初始化獎品數組，以及按照從上到下，從左到右的順序佈局UI界面code

_itemTitleArray = @[@"3跳幣",@"嘉年華門票",@"8跳幣",@"10朵花",@"128朵花",@"2018跳幣",@"528跳幣",@"128跳幣",@"28朵花",@"88跳幣"];
for (int i = 0 ; i < 4; i ++) {
        UIImageView *img = [[UIImageView alloc] initWithFrame:CGRectMake(i*82*XT, 0, 78*XT, 80*XT)];
        [img setImage:[UIImage imageNamed:itemImgArray[i]]];
        [itemView addSubview:img];
        
        UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 63*XT, 78*XT, 13*XT)];
        label.textAlignment = NSTextAlignmentCenter;
        label.textColor = [UIColor whiteColor];
        label.font = [UIFont systemFontOfSize:13*XT];
        label.text = _itemTitleArray[I];
        [img addSubview:label];
    }
    
    for (int i = 0 ; i < 2; i ++) {
        UIImageView *img = [[UIImageView alloc] initWithFrame:CGRectMake(i*(78*XT+169*XT), 84*XT, 78*XT, 80*XT)];
        [img setImage:[UIImage imageNamed:itemImgArray[i+4]]];
        [itemView addSubview:img];
        
        UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 63*XT, 78*XT, 13*XT)];
        label.textAlignment = NSTextAlignmentCenter;
        label.textColor = [UIColor whiteColor];
        label.font = [UIFont systemFontOfSize:13*XT];
        label.text = _itemTitleArray[i+4];
        [img addSubview:label];
    }
    
    for (int i = 0 ; i < 4; i ++) {
        UIImageView *img = [[UIImageView alloc] initWithFrame:CGRectMake(i*82*XT, 168*XT, 78*XT, 80*XT)];
        [img setImage:[UIImage imageNamed:itemImgArray[i+6]]];
        [itemView addSubview:img];
        
        UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 63*XT, 78*XT, 13*XT)];
        label.textAlignment = NSTextAlignmentCenter;
        label.textColor = [UIColor whiteColor];
        label.font = [UIFont systemFontOfSize:13*XT];
        label.text = _itemTitleArray[i+6];
        [img addSubview:label];
    }

2.點擊以後開始抽獎按鈕後，先快速地將選中框正時針轉三圈，再慢速地在一圈以內旋轉至中獎位置，請注意是按照正時針的順序旋轉，和UI佈局的順序不一致，如圖所示： [圖片上傳中...(image.png-7c3fa7-1550233962701-0)]blog

- (void)getLotteryInfo
{
    // 快速旋轉計數，在NSTimer的方法下自增到29時結束，表明選中框快速旋轉了三圈，結束快速旋轉
    _fastIndex = 0;

    // 慢速旋轉計數，在NSTimer的方法下自增到下面 _selectedIndex 的數字時，選中框到達中獎位置，結束慢速旋轉
    _slowIndex = -1;

    // 中獎位置計數，按照順時針的順序，如上圖所示，若 _selectedIndex = 9 則得到 9 所在位置的獎品
    _selectedIndex = arc4random()%10;
  
    // 根據獎品數組，獲取中獎信息
    if (_selectedIndex<4) {
        _result = _itemTitleArray[_selectedIndex];
    }else if (_selectedIndex == 4){
        _result = @"2018跳幣";
    }else if (_selectedIndex == 5){
        _result = @"88跳幣";
    }else if (_selectedIndex == 6){
        _result = @"28朵花";
    }else if (_selectedIndex == 7){
        _result = @"128跳幣";
    }else if (_selectedIndex == 8){
        _result = @"528跳幣";
    }else if (_selectedIndex == 9){
        _result = @"128朵花";
    }
    _itemBorderView.hidden = NO;

    // 開啓快速旋轉，時間間隔爲0.1秒
    _fastTimer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(fastTimerEvent) userInfo:nil repeats:YES];
    [[NSRunLoop currentRunLoop] addTimer:_fastTimer forMode:NSRunLoopCommonModes];
}

3.NSTimer 快速旋轉事件事件

- (void)fastTimerEvent
{
    // _fastIndex 自增
    _fastIndex = _fastIndex + 1;

    // 順時針移動選中框的位置
    if (_fastIndex % 10 == 0) {
        [_itemBorderView setFrame:CGRectMake(-1*XT, -1*XT, 80*XT, 82*XT)];
    }else if (_fastIndex % 10 == 1){
        [_itemBorderView setFrame:CGRectMake(82*XT-1*XT, -1*XT, 80*XT, 82*XT)];
    }else if (_fastIndex % 10 == 2){
        [_itemBorderView setFrame:CGRectMake(2*82*XT-1*XT, -1*XT, 80*XT, 82*XT)];
    }else if (_fastIndex % 10 == 3){
        [_itemBorderView setFrame:CGRectMake(3*82*XT-1*XT, -1*XT, 80*XT, 82*XT)];
    }else if (_fastIndex % 10 == 4){
        [_itemBorderView setFrame:CGRectMake(3*82*XT-1*XT, 84*XT-1*XT, 80*XT, 82*XT)];
    }else if (_fastIndex % 10 == 5){
        [_itemBorderView setFrame:CGRectMake(3*82*XT-1*XT, 2*84*XT-1*XT, 80*XT, 82*XT)];
    }else if (_fastIndex % 10 == 6){
        [_itemBorderView setFrame:CGRectMake(2*82*XT-1*XT, 2*84*XT-1*XT, 80*XT, 82*XT)];
    }else if (_fastIndex % 10 == 7){
        [_itemBorderView setFrame:CGRectMake(82*XT-1*XT, 2*84*XT-1*XT, 80*XT, 82*XT)];
    }else if (_fastIndex % 10 == 8){
        [_itemBorderView setFrame:CGRectMake(-1*XT, 2*84*XT-1*XT, 80*XT, 82*XT)];
    }else if (_fastIndex % 10 == 9){
        [_itemBorderView setFrame:CGRectMake(-1*XT, 84*XT-1*XT, 80*XT, 82*XT)];
    }

    // _fastIndex = 29 時選中框結束快速旋轉，開啓慢速旋轉，時間間隔爲0.45秒
    if (_fastIndex >= 29) {
        [_fastTimer invalidate];
        _slowTimer = [NSTimer scheduledTimerWithTimeInterval:0.45 target:self selector:@selector(slowTimerEvent) userInfo:nil repeats:YES];
        [[NSRunLoop currentRunLoop] addTimer:_slowTimer forMode:NSRunLoopCommonModes];
    }
}

4.NSTimer 慢速旋轉事件

// 慢速移動動畫
- (void)slowTimerEvent
{
    // _slowIndex 自增
    _slowIndex = _slowIndex + 1;

    // 順時針移動轉中框的位置
    if (_slowIndex % 10 == 0) {
        [_itemBorderView setFrame:CGRectMake(-1*XT, -1*XT, 80*XT, 82*XT)];
    }else if (_slowIndex % 10 == 1){
        [_itemBorderView setFrame:CGRectMake(82*XT-1*XT, -1*XT, 80*XT, 82*XT)];
    }else if (_slowIndex % 10 == 2){
        [_itemBorderView setFrame:CGRectMake(2*82*XT-1*XT, -1*XT, 80*XT, 82*XT)];
    }else if (_slowIndex % 10 == 3){
        [_itemBorderView setFrame:CGRectMake(3*82*XT-1*XT, -1*XT, 80*XT, 82*XT)];
    }else if (_slowIndex % 10 == 4){
        [_itemBorderView setFrame:CGRectMake(3*82*XT-1*XT, 84*XT-1*XT, 80*XT, 82*XT)];
    }else if (_slowIndex % 10 == 5){
        [_itemBorderView setFrame:CGRectMake(3*82*XT-1*XT, 2*84*XT-1*XT, 80*XT, 82*XT)];
    }else if (_slowIndex % 10 == 6){
        [_itemBorderView setFrame:CGRectMake(2*82*XT-1*XT, 2*84*XT-1*XT, 80*XT, 82*XT)];
    }else if (_slowIndex % 10 == 7){
        [_itemBorderView setFrame:CGRectMake(82*XT-1*XT, 2*84*XT-1*XT, 80*XT, 82*XT)];
    }else if (_slowIndex % 10 == 8){
        [_itemBorderView setFrame:CGRectMake(-1*XT, 2*84*XT-1*XT, 80*XT, 82*XT)];
    }else if (_slowIndex % 10 == 9){
        [_itemBorderView setFrame:CGRectMake(-1*XT, 84*XT-1*XT, 80*XT, 82*XT)];
    }

    // 當  _slowIndex >= _selectedIndex 時選中框結束慢速旋轉，開啓中獎獎品界面
    if (_slowIndex >= _selectedIndex) {
        [_slowTimer invalidate];

        dispatch_time_t delayTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.5/*延遲執行時間*/ * NSEC_PER_SEC));
        dispatch_after(delayTime, dispatch_get_main_queue(), ^{
            self.startButton.userInteractionEnabled = YES;
            [self showLotteryRlesultView];
        });
    }
}

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