您好,登錄后才能下訂單哦!
這篇文章主要為大家展示了“iOS如何實現(xiàn)一個可以在屏幕中自由移動的按鈕”,內(nèi)容簡而易懂,條理清晰,希望能夠幫助大家解決疑惑,下面讓小編帶領(lǐng)大家一起研究并學(xué)習(xí)一下“iOS如何實現(xiàn)一個可以在屏幕中自由移動的按鈕”這篇文章吧。
效果圖如下:
其實實現(xiàn)很簡單,只需要寫.m就可以了
示例代碼
#import "CrossBtnVC.h"
@interface CrossBtnVC () { CGPoint beginPoint; CGFloat rightMargin; CGFloat leftMargin; CGFloat topMargin; CGFloat bottomMargin; CGMutablePathRef pathRef; } @property (nonatomic,strong) UIButton *crossBtn;//聊天移動 @end
@implementation CrossBtnVC
- (void)viewDidLoad { [super viewDidLoad]; self.view.backgroundColor = [UIColor whiteColor]; _crossBtn = [UIButton buttonWithType:UIButtonTypeCustom]; [_crossBtn setImage:[UIImage imageNamed:@"移動聊天"] forState:UIControlStateNormal]; _crossBtn.frame = CGRectMake(UI_View_Width-54*UI_Width_Scale, UI_View_Height-103, 40, 40); [self.view addSubview:_crossBtn]; [_crossBtn addTarget:self action:@selector(btnAction:) forControlEvents:UIControlEventTouchUpInside]; UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(handlePan:)]; [_crossBtn addGestureRecognizer:pan]; rightMargin = [UIScreen mainScreen].bounds.size.width-30; leftMargin = 30; bottomMargin = [UIScreen mainScreen].bounds.size.height-30-50; topMargin = 30+64; pathRef=CGPathCreateMutable(); CGPathMoveToPoint(pathRef, NULL, leftMargin, topMargin); CGPathAddLineToPoint(pathRef, NULL, rightMargin, topMargin); CGPathAddLineToPoint(pathRef, NULL, rightMargin, bottomMargin); CGPathAddLineToPoint(pathRef, NULL, leftMargin, bottomMargin); CGPathAddLineToPoint(pathRef, NULL, leftMargin, topMargin); CGPathCloseSubpath(pathRef); }
#pragma mark - 事件 - (void)btnAction:(UIButton*)sender{ }
#pragma mark - 手勢 - (void)handlePan:(UIPanGestureRecognizer *)pan { if (pan.state == UIGestureRecognizerStateBegan) { beginPoint = [pan locationInView:self.view]; }else if (pan.state == UIGestureRecognizerStateChanged){ CGPoint nowPoint = [pan locationInView:self.view]; float offsetX = nowPoint.x - beginPoint.x; float offsetY = nowPoint.y - beginPoint.y; CGPoint centerPoint = CGPointMake(beginPoint.x + offsetX, beginPoint.y + offsetY); if (CGPathContainsPoint(pathRef, NULL, centerPoint, NO)) { _crossBtn.center = centerPoint; }else{ if (centerPoint.y>bottomMargin) { if (centerPoint.x<rightMargin&¢erPoint.x>leftMargin) { _crossBtn.center = CGPointMake(beginPoint.x + offsetX, bottomMargin); } } else if (centerPoint.y<topMargin) { if (centerPoint.x<rightMargin&¢erPoint.x>leftMargin) { _crossBtn.center = CGPointMake(beginPoint.x + offsetX, topMargin); } } else if (centerPoint.x>rightMargin) { _crossBtn.center = CGPointMake(rightMargin, beginPoint.y + offsetY); } else if (centerPoint.x<leftMargin) { _crossBtn.center = CGPointMake(leftMargin, beginPoint.y + offsetY); } } }else if (pan.state == UIGestureRecognizerStateEnded || pan.state == UIGestureRecognizerStateFailed){ } } @end
以上是“iOS如何實現(xiàn)一個可以在屏幕中自由移動的按鈕”這篇文章的所有內(nèi)容,感謝各位的閱讀!相信大家都有了一定的了解,希望分享的內(nèi)容對大家有所幫助,如果還想學(xué)習(xí)更多知識,歡迎關(guān)注億速云行業(yè)資訊頻道!
免責(zé)聲明:本站發(fā)布的內(nèi)容(圖片、視頻和文字)以原創(chuàng)、轉(zhuǎn)載和分享為主,文章觀點不代表本網(wǎng)站立場,如果涉及侵權(quán)請聯(lián)系站長郵箱:is@yisu.com進(jìn)行舉報,并提供相關(guān)證據(jù),一經(jīng)查實,將立刻刪除涉嫌侵權(quán)內(nèi)容。