本文主要给大家介绍了利用ios实现一个可以在屏幕中自由移动的按钮的相关内容，分享出来供大家参考学习，下面话不多说，来一起看看详细的介绍。
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
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#import "crossbtnvc.h" |
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@interface crossbtnvc (){ cgpoint beginpoint; cgfloat rightmargin; cgfloat leftmargin; cgfloat topmargin; cgfloat bottommargin; cgmutablepathref pathref;}@property (nonatomic,strong) uibutton *crossbtn;//聊天移动@end |
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@implementation crossbtnvc |
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- (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);} |
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#pragma mark - 事件- (void)btnaction:(uibutton*)sender{} |
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#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
以上就是这篇文章的全部内容了，希望本文的内容对各位ios开发者们能带来一定的帮助，如果有疑问大家可以留言交流，谢谢大家对服务器之家的支持。
原文链接：http://www.jianshu.com/p/519da0327614
