1.实现原理
将所有按钮放在viewcontroller的_buttonArray集合中，同时赋值给按钮中
增加长按手势的响应
当手势坐标进入其他按钮的frame时，调整集合中按钮位置；
当长按手势开始，放大按钮； 结束时还原按钮
2.附源码及注释[按钮调控已实现动画]
@interface UIDragButton : UIButton {
CGPoint _prePoint; // 移动过程中的上一个点
BOOL _isPress; // 是否按下：实现过程未用到
CGPoint _framePoint; // 未放大情况下frame的左上角坐标
CGRect _frameRect; // 未放大情况下frame值
}
@property (nonatomic, assign) NSMutableArray *buttonArray; // button集合
@property (nonatomic, assign) NSInteger indexOfArray; // 当前按钮在集合中的下标
// 移动动画，实现过程未用到，暂不能用
- (void)moveTo:(CGRect)rect Animation:(BOOL)flag;
// 初始化一些样式，即长按手势
- (void)initStyle;
@end
.m
@implementation UIDragButton
/*
* 样式初始化，即手势初始化
**/
- (void)initStyle {
self.backgroundColor = [UIColor whiteColor];
self.layer.borderWidth = 0.3;
self.layer.borderColor = [UIColor grayColor].CGColor;
UILongPressGestureRecognizer * longPressGr = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressToDo:)];
longPressGr.minimumPressDuration = 1.0;
[self addGestureRecognizer:longPressGr];
}
#pragma mark - 按钮尺寸更改
// 放大
- (void)changeBig {
self.transform = CGAffineTransformScale(self.transform,1.25,1.25);
self.backgroundColor = [UIColor colorWithHexString:@"E0E0E0" alpha:1];
}
// 还原
- (void)changeBack {
self.transform = CGAffineTransformScale(self.transform,0.8,0.8);
// 按钮放大还原后会有偏移，所以要设置回正常位置，80和100是按钮尺寸
self.frame = CGRectMake(_framePoint.x, _framePoint.y, 80, 100);
}
#pragma mark - 手势管理
/*
* 手势响应，并判断状态
**/
- (void)longPressToDo:(UILongPressGestureRecognizer *)press {
if ([press state] == UIGestureRecognizerStateBegan) {
[self beganTouch:press];
[self changeBig]; // 放大
}
else if ([press state] == UIGestureRecognizerStateChanged) {
[self movedTouch:press];
}
else if ([press state] == UIGestureRecognizerStateEnded){
[self endedTouch:press];
}
}
/*
* 手势长按开始
**/
- (void)beganTouch:(UILongPressGestureRecognizer *)press {
_prePoint = [press locationInView:self];
_frameRect = self.frame;
_framePoint = self.frame.origin;
// 该通知用于告诉controller点击的是第几个按钮，用于将该按钮放在最上层
[[NSNotificationCenter defaultCenter] postNotificationName:@"buttonChanged" object:[NSNumber numberWithInteger:_indexOfArray]];
}
/*
* 手势长按结束
**/
- (void)endedTouch:(UILongPressGestureRecognizer *)press {
_prePoint = [press locationInView:self];
[self changeBack];
self.backgroundColor = [UIColor whiteColor];
}
/*
* 长按过程中移动
**/
- (void)movedTouch:(UILongPressGestureRecognizer *)press {
CGPoint now = [press locationInView:self];
NSInteger x = now.x - _prePoint.x;
NSInteger y = now.y - _prePoint.y;
self.frame = CGRectMake(self.frame.origin.x+x, self.frame.origin.y+y, self.frame.size.width, self.frame.size.height);
[self placeIsChanged:CGPointMake(self.frame.origin.x + _prePoint.x, self.frame.origin.y + _prePoint.y)];
}
#pragma mark - 按钮调整
/*
* 判断当前按钮位置是否变化，并进行调整
**/
- (void)placeIsChanged:(CGPoint)point {
for (NSInteger i = 0; i < [self.buttonArray count]; i++) {
if ([self pointIn:point rect:((UIButton *)[_buttonArray objectAtIndex:i]).frame]
&& _indexOfArray != i) {
[self adjustButtons:i];
}
}
}
/*
* 判断点是否在rect内
**/
- (BOOL)pointIn:(CGPoint)point rect:(CGRect)rect {
if (point.x > rect.origin.x && point.y > rect.origin.y && point.x < rect.origin.x+rect.size.width && point.y < rect.origin.y+rect.size.height) {
return YES;
}
return NO;
}
/*
* 调整按钮位置
**/
- (void)adjustButtons:(NSInteger)index {
CGRect rect = ((UIButton *)[_buttonArray objectAtIndex:index]).frame;
__block NSInteger i = 0;
__block NSInteger num = index;
// 将靠前的按钮移动到靠后的位置
if (_indexOfArray < index) {
// 将上一个按钮的位置赋值给当前按钮
[UIView animateWithDuration:0.5 animations:^{
for (i = num; i > _indexOfArray+1; i--) {
((UIDragButton *)[_buttonArray objectAtIndex:i]).frame = ((UIDragButton *)[_buttonArray objectAtIndex:i-1]).frame;
}
((UIDragButton *)[_buttonArray objectAtIndex:i]).frame = _frameRect;
}];
_frameRect = rect;
// 调整顺序 保证数组中按钮的frame按顺序排列
for (i = _indexOfArray; i < index; i++) {
[_buttonArray exchangeObjectAtIndex:i withObjectAtIndex:i+1];
((UIDragButton *)[_buttonArray objectAtIndex:i]).indexOfArray = i;
}
((UIDragButton *)[_buttonArray objectAtIndex:index]).indexOfArray = index;
}
else { // 将靠后的按钮移动到前边
// 将上一个按钮的位置赋值给当前按钮
[UIView animateWithDuration:0.5 animations:^{
for (i = num; i < _indexOfArray-1; i++) {
((UIDragButton *)[_buttonArray objectAtIndex:i]).frame = ((UIDragButton *)[_buttonArray objectAtIndex:i+1]).frame;
}
((UIDragButton *)[_buttonArray objectAtIndex:i]).frame = _frameRect;
}];
_frameRect = rect;
// 调整顺序 保证数组中按钮的frame按顺序排列
for (i = _indexOfArray; i > index; i--) {
[_buttonArray exchangeObjectAtIndex:i withObjectAtIndex:i-1];
((UIDragButton *)[_buttonArray objectAtIndex:i]).indexOfArray = i;
}
((UIDragButton *)[_buttonArray objectAtIndex:index]).indexOfArray = index;
}
_framePoint = _frameRect.origin;
}
#pragma mark - 按钮移动动画
- (void)moveTo:(CGRect)rect Animation:(BOOL)flag {
if (flag) {
// 计算偏移并移动
float x = rect.origin.x - self.frame.origin.x;
float y = rect.origin.y - self.frame.origin.y;
[self.layer addAnimation:[self moveX:0.1 X:[NSNumber numberWithFloat:x]] forKey:nil];
[self.layer addAnimation:[self moveY:0.1 Y:[NSNumber numberWithFloat:y]] forKey:nil];
}
else {
self.frame = rect;
}
}
- (CABasicAnimation *)moveX:(float)time X:(NSNumber *)x // 横向移动
{
CABasicAnimation *animation=[CABasicAnimation animationWithKeyPath:@"transform.translation.x"];
animation.toValue=x;
animation.duration=time; // 动画持续时间
animation.removedOnCompletion=NO;
animation.fillMode=kCAFillModeForwards;
return animation;
}
- (CABasicAnimation *)moveY:(float)time Y:(NSNumber *)y // 纵向移动
{
CABasicAnimation *animation=[CABasicAnimation animationWithKeyPath:@"transform.translation.y"];
animation.toValue=y;
animation.duration=time;
animation.removedOnCompletion=NO;
animation.fillMode=kCAFillModeForwards;
return animation;
}
@end
