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
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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]; }); } }
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