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
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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
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