iOS实现一个可以在屏幕中*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&&centerpoint.x>leftmargin) {
     _crossbtn.center = cgpointmake(beginpoint.x + offsetx, bottommargin);
    }
   }
   else if (centerpoint.y<topmargin)
   {
    if (centerpoint.x<rightmargin&&centerpoint.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，谢谢大家对的支持。