DragEnableButton

屏幕快照 2017-11-21 下午5.35.41.png

继承于 UIImageView

#import "DragEnableView.h"
#define PADDING     5


@interface DragEnableView () {
    CGPoint beginPoint;
}
@end

@implementation DragEnableView

- (instancetype)initWithFrame:(CGRect)frame
{
    if (self = [super initWithFrame:frame]) {
        self.userInteractionEnabled = YES;
    }
    return self;
}

- (instancetype)init
{
    if (self = [super init]) {
        self.userInteractionEnabled = YES;
    }
    return self;
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    
    beginPoint = [touch locationInView:self];
    
    [[self superview] bringSubviewToFront:self];
}


- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    
    CGPoint nowPoint = [touch locationInView:self];
    
    float offsetX = nowPoint.x - beginPoint.x;
    float offsetY = nowPoint.y - beginPoint.y;
    
    self.center = CGPointMake(self.center.x + offsetX, self.center.y + offsetY);
}

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    [self setNewDraggedViewFrame];
}

- (void)touchesCancelled:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    [self setNewDraggedViewFrame];
}

- (void)setNewDraggedViewFrame
{
    float marginLeft = self.frame.origin.x;
    float marginRight = self.superview.frame.size.width - self.frame.origin.x - self.frame.size.width;
    float marginTop = self.frame.origin.y;
    float marginBottom = self.superview.frame.size.height - self.frame.origin.y - self.frame.size.height;
    
    //    marginLeft<marginRight?PADDING:
    if (marginTop<98) {
        self.frame = CGRectMake(marginLeft<marginRight?PADDING:self.superview.frame.size.width - self.frame.size.width-PADDING,
                                PADDING,
                                self.frame.size.width,
                                self.frame.size.height);
    }
    else if (marginBottom<83) {
        self.frame = CGRectMake(marginLeft<marginRight?PADDING:self.superview.frame.size.width - self.frame.size.width-PADDING,
                                self.superview.frame.size.height - self.frame.size.height-PADDING,
                                self.frame.size.width,
                                self.frame.size.height);
        
    }
    else {
        self.frame = CGRectMake(marginLeft<marginRight?PADDING:self.superview.frame.size.width - self.frame.size.width-PADDING,
                                self.frame.origin.y,
                                self.frame.size.width,
                                self.frame.size.height);
    }
}
@end

初始化

DragEnableView *dragEnableView = [DragEnableView new];
dragEnableView.frame = CGRectMake(0, 0, 83, 93);
dragEnableView.image = [UIImage imageNamed:@"blessingpackage"];
[self.view addSubview:dragEnableView];