https://github.com/zhengwenming/WMDragView
//
// WMDragView.m
// DragButtonDemo
//
// Created by zhengwenming on 2016/12/16.
//
//
#import "WMDragView.h"
@interface WMDragView ()
@property (nonatomic,assign) CGPoint startPoint;
@property (nonatomic,strong) UIPanGestureRecognizer *panGestureRecognizer;
@property (nonatomic,assign) CGFloat previousScale;
@end
@implementation WMDragView
/**
WMDragView内部的一个控件imageView
默认充满父视图
@return 懒加载这个imageView
*/
-(UIImageView *)imageView{
if (_imageView==nil) {
_imageView = [[UIImageView alloc]init];
_imageView.userInteractionEnabled = YES;
_imageView.clipsToBounds = YES;
_imageView.frame = (CGRect){CGPointZero,self.bounds.size};
[self.contentViewForDrag addSubview:_imageView];
}
return _imageView;
}
/**
WMDragView内部的一个控件button
默认充满父视图
@return 懒加载这个imageView
*/
-(UIButton *)button{
if (_button==nil) {
_button = [UIButton buttonWithType:UIButtonTypeCustom];
_button.clipsToBounds = YES;
_button.userInteractionEnabled = NO;
_button.frame = (CGRect){CGPointZero,self.bounds.size};
[self.contentViewForDrag addSubview:_button];
}
return _button;
}
-(UIView *)contentViewForDrag{
if (_contentViewForDrag==nil) {
_contentViewForDrag = [[UIView alloc]init];
_contentViewForDrag.clipsToBounds = YES;
_contentViewForDrag.frame = (CGRect){CGPointZero,self.bounds.size};
[self addSubview:self.contentViewForDrag];
}
return _contentViewForDrag;
}
///代码初始化
- (instancetype)init{
self = [super init];
if (self) {
[self setUp];
}
return self;
}
- (instancetype)initWithFrame:(CGRect)frame{
self = [super initWithFrame:frame];
if (self) {
[self setUp];
}
return self;
}
///从xib中加载
-(void)awakeFromNib{
[super awakeFromNib];
[self setUp];
}
-(void)layoutSubviews{
if (self.freeRect.origin.x!=0||self.freeRect.origin.y!=0||self.freeRect.size.height!=0||self.freeRect.size.width!=0) {
//设置了freeRect--活动范围
}else{
//没有设置freeRect--活动范围，则设置默认的活动范围为父视图的frame
self.freeRect = (CGRect){CGPointZero,self.superview.bounds.size};
}
}
-(void)setUp{
self.dragEnable = YES;//默认可以拖曳
self.clipsToBounds = YES;
self.isKeepBounds = NO;
self.backgroundColor = [UIColor lightGrayColor];
UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(clickDragView)];
[self addGestureRecognizer:singleTap];
//添加移动手势可以拖动
self.panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(dragAction:)];
self.panGestureRecognizer.minimumNumberOfTouches = 1;
self.panGestureRecognizer.maximumNumberOfTouches = 1;
[self addGestureRecognizer:self.panGestureRecognizer];
}
/**
拖动事件
@param pan 拖动手势
*/
-(void)dragAction:(UIPanGestureRecognizer *)pan{
//先判断可不可以拖动，如果不可以拖动，直接返回，不操作
if (self.dragEnable==NO) {
return;
}
switch (pan.state) {
case UIGestureRecognizerStateBegan:{///开始拖动
if (self.beginDragBlock) {
self.beginDragBlock(self);
}
// 注意一旦你完成上述的移动，将translation重置为0十分重要。否则translation每次都会叠加
[pan setTranslation:CGPointZero inView:self];
//保存触摸起始点位置
self.startPoint = [pan translationInView:self];
//该view置于最前
[self.superview bringSubviewToFront:self];
break;
}
case UIGestureRecognizerStateChanged:{///拖动中
//计算位移 = 当前位置 - 起始位置
if (self.duringDragBlock) {
self.duringDragBlock(self);
}
CGPoint point = [pan translationInView:self];
float dx;
float dy;
switch (self.dragDirection) {
case WMDragDirectionAny:
dx = point.x - self.startPoint.x;
dy = point.y - self.startPoint.y;
break;
case WMDragDirectionHorizontal:
dx = point.x - self.startPoint.x;
dy = 0;
break;
case WMDragDirectionVertical:
dx = 0;
dy = point.y - self.startPoint.y;
break;
default:
dx = point.x - self.startPoint.x;
dy = point.y - self.startPoint.y;
break;
}
//计算移动后的view中心点
CGPoint newCenter = CGPointMake(self.center.x + dx, self.center.y + dy);
//移动view
self.center = newCenter;
// 注意一旦你完成上述的移动，将translation重置为0十分重要。否则translation每次都会叠加
[pan setTranslation:CGPointZero inView:self];
break;
}
case UIGestureRecognizerStateEnded:{///拖动结束
[self keepBounds];
if (self.endDragBlock) {
self.endDragBlock(self);
}
break;
}
default:
break;
}
}
///点击事件
-(void)clickDragView{
if (self.clickDragViewBlock) {
self.clickDragViewBlock(self);
}
}
- (void)keepBounds{
//中心点判断
float centerX = self.freeRect.origin.x+(self.freeRect.size.width - self.frame.size.width)/2;
CGRect rect = self.frame;
if (self.isKeepBounds==NO) {//没有黏贴边界的效果
if (self.frame.origin.x < self.freeRect.origin.x) {
CGContextRef context = UIGraphicsGetCurrentContext();
[UIView beginAnimations:@"leftMove" context:context];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationDuration:0.5];
rect.origin.x = self.freeRect.origin.x;
self.frame = rect;
[UIView commitAnimations];
} else if(self.freeRect.origin.x+self.freeRect.size.width < self.frame.origin.x+self.frame.size.width){
CGContextRef context = UIGraphicsGetCurrentContext();
[UIView beginAnimations:@"rightMove" context:context];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationDuration:0.5];
rect.origin.x = self.freeRect.origin.x+self.freeRect.size.width-self.frame.size.width;
self.frame = rect;
[UIView commitAnimations];
}
}else if(self.isKeepBounds==YES){//自动粘边
if (self.frame.origin.x< centerX) {
CGContextRef context = UIGraphicsGetCurrentContext();
[UIView beginAnimations:@"leftMove" context:context];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationDuration:0.5];
rect.origin.x = self.freeRect.origin.x;
self.frame = rect;
[UIView commitAnimations];
} else {
CGContextRef context = UIGraphicsGetCurrentContext();
[UIView beginAnimations:@"rightMove" context:context];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationDuration:0.5];
rect.origin.x =self.freeRect.origin.x+self.freeRect.size.width - self.frame.size.width;
self.frame = rect;
[UIView commitAnimations];
}
}
if (self.frame.origin.y < self.freeRect.origin.y) {
CGContextRef context = UIGraphicsGetCurrentContext();
[UIView beginAnimations:@"topMove" context:context];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationDuration:0.5];
rect.origin.y = self.freeRect.origin.y;
self.frame = rect;
[UIView commitAnimations];
} else if(self.freeRect.origin.y+self.freeRect.size.height< self.frame.origin.y+self.frame.size.height){
CGContextRef context = UIGraphicsGetCurrentContext();
[UIView beginAnimations:@"bottomMove" context:context];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationDuration:0.5];
rect.origin.y = self.freeRect.origin.y+self.freeRect.size.height-self.frame.size.height;
self.frame = rect;
[UIView commitAnimations];
}
}
@end
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