iOS实现一个可以在屏幕中自由移动的按钮
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效果图如下:
其实实现很简单,只需要写.m就可以了
示例代码
#import "CrossBtnVC.h"
@interface CrossBtnVC () { CGPoint beginPoint; CGFloat rightMargin; CGFloat leftMargin; CGFloat topMargin; CGFloat bottomMargin; CGMutablePathRef pathRef; } @property (nonatomic,strong) UIButton *crossBtn;//聊天移动 @end
@implementation CrossBtnVC
- (void)viewDidLoad { [super viewDidLoad]; self.view.backgroundColor = [UIColor whiteColor]; _crossBtn = [UIButton buttonWithType:UIButtonTypeCustom]; [_crossBtn setImage:[UIImage imageNamed:@"移动聊天"] 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 - 手势 - (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
总结
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