iOS實現(xiàn)新年抽獎轉(zhuǎn)盤效果的思路

更新時間：2020年04月17日 14:41:31 作者：qq_27501365

這篇文章主要為大家詳細介紹了iOS實現(xiàn)抽獎轉(zhuǎn)盤效果的思路，文中示例代碼介紹的非常詳細，具有一定的參考價值，感興趣的小伙伴們可以參考一下

臨近春節(jié)，相信不少app都會加一個新的需求——新年抽獎

不多廢話，先上GIF效果圖

DEMO鏈接

1. 跑馬燈效果

2. 抽獎效果

實現(xiàn)步驟：

一、跑馬燈效果

其實很簡單，就是通過以下兩張圖片，用NSTimer無限替換，達到跑馬燈的效果

bg_lamp_1@2x.png

bg_lamp_2@2x.png

實現(xiàn)代碼：

_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"]];
 }
}

二、抽獎效果

1.初始化獎品數(shù)組，以及按照 從上到下，從左到右 的順序布局UI界面

_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.點擊之后開始抽獎按鈕后，先快速地將選中框 正時針 轉(zhuǎn)三圈，再慢速地在 一圈之內(nèi) 旋轉(zhuǎn)至中獎位置，請注意是按照 正時針 的順序旋轉(zhuǎn)，和UI布局的順序不一致，如圖所示：

- (void)getLotteryInfo
{
 // 快速旋轉(zhuǎn)計數(shù)，在NSTimer的方法下自增到29時結(jié)束，代表選中框快速旋轉(zhuǎn)了三圈，結(jié)束快速旋轉(zhuǎn)
 _fastIndex = 0;

 // 慢速旋轉(zhuǎn)計數(shù)，在NSTimer的方法下自增到下面 _selectedIndex 的數(shù)字時，選中框到達中獎位置，結(jié)束慢速旋轉(zhuǎn)
 _slowIndex = -1;

 // 中獎位置計數(shù)，按照順時針的順序，如上圖所示，若 _selectedIndex = 9 則獲得 9 所在位置的獎品
 _selectedIndex = arc4random()%10;
 
 // 根據(jù)獎品數(shù)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;

 // 開啟快速旋轉(zhuǎn)，時間間隔為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(zhuǎn)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(jié)束快速旋轉(zhuǎn)，開啟慢速旋轉(zhuǎn)，時間間隔為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(zhuǎn)事件

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

 // 順時針移動轉(zhuǎn)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(jié)束慢速旋轉(zhuǎn)，開啟中獎獎品界面
 if (_slowIndex >= _selectedIndex) {
 [_slowTimer invalidate];

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

以上就是本文的全部內(nèi)容，希望對大家的學習有所幫助，也希望大家多多支持腳本之家。

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