前言

開發(fā)中會(huì)遇到有懸浮按鈕功能。

效果

上代碼

SuspensionButton.h

#import <UIKit/UIKit.h>NS_ASSUME_NONNULL_BEGIN@interface SuspensionButton : UIButton@property(nonatomic, assign)BOOL MoveEnable;@property(nonatomic, assign)BOOL MoveEnabled;@property(nonatomic, assign)CGPoint beginpoint;@endNS_ASSUME_NONNULL_END

SuspensionButton.m

#import 'SuspensionButton.h'@implementation SuspensionButton- (instancetype)initWithFrame:(CGRect)frame { if (self = [super initWithFrame:frame]) { self.frame = CGRectMake([[UIScreen mainScreen] bounds].size.width - 51, 50, 51, 51); [self setBackgroundImage:[UIImage imageNamed:@'icon_move'] forState:UIControlStateNormal]; [self setTitle:@'Button' forState:UIControlStateNormal]; self.titleLabel.font = [UIFont systemFontOfSize:10]; [self setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; _MoveEnable = YES; } return self;}//開始觸摸的方法//觸摸-清掃- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { _MoveEnabled = NO; [super touchesBegan:touches withEvent:event]; if (!_MoveEnable) { return; } UITouch *touch = [touches anyObject]; _beginpoint = [touch locationInView:self];}//觸摸移動(dòng)的方法- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { _MoveEnabled = YES;//單擊事件可用 if (!_MoveEnable) { return; } UITouch *touch = [touches anyObject]; CGPoint currentPosition = [touch locationInView:self]; //偏移量 float offsetX = currentPosition.x - _beginpoint.x; float offsetY = currentPosition.y - _beginpoint.y; //移動(dòng)后的中心坐標(biāo) self.center = CGPointMake(self.center.x + offsetX, self.center.y + offsetY); //x軸左右極限坐標(biāo) if (self.center.x > (self.superview.frame.size.width - self.frame.size.width / 2)) { CGFloat x = self.superview.frame.size.width - self.frame.size.width / 2; self.center = CGPointMake(x, self.center.y + offsetY); } else if (self.center.x < self.frame.size.width / 2) { CGFloat x = self.frame.size.width / 2; self.center = CGPointMake(x, self.center.y + offsetY); } //y軸上下極限坐標(biāo) if (self.center.y > (self.superview.frame.size.height - self.frame.size.height)) { CGFloat x = self.center.x; CGFloat y = self.superview.frame.size.height - self.frame.size.height * 1.5; self.center = CGPointMake(x, y); } else if (self.center.y <= self.frame.size.height) { CGFloat x = self.center.x; CGFloat y = self.frame.size.height * 1.2; self.center = CGPointMake(x, y); }}- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { if (!_MoveEnable) { return; } if (self.center.x >= self.superview.frame.size.width / 2) {//向右側(cè)移動(dòng) //偏移動(dòng)畫 [UIView beginAnimations:@'move' context:nil]; [UIView setAnimationDuration:1]; [UIView setAnimationDelegate:self]; self.frame = CGRectMake(self.superview.frame.size.width - 51, self.center.y - 25.5, 51, 51); //提交UIView動(dòng)畫 [UIView commitAnimations]; } else {//向左側(cè)移動(dòng) [UIView beginAnimations:@'move' context:nil]; [UIView setAnimationDuration:1]; [UIView setAnimationDelegate:self]; self.frame=CGRectMake(0.f,self.center.y - 25.5, 51, 51); //提交UIView動(dòng)畫 [UIView commitAnimations]; } //不加此句話，UIButton將一直處于按下狀態(tài) [super touchesEnded: touches withEvent: event]; }@end

使用

ViewController.m

#import 'ViewController.h'#import 'SuspensionButton.h'//懸浮按鈕@interface ViewController ()@property(nonatomic, strong) SuspensionButton *suspensionButton;@end@implementation ViewController- (void)viewDidLoad { [super viewDidLoad]; [self.view addSubview:self.suspensionButton];}- (SuspensionButton *)suspensionButton { if(_suspensionButton == nil) { _suspensionButton = [SuspensionButton buttonWithType:UIButtonTypeCustom]; _suspensionButton.backgroundColor = [UIColor grayColor]; _suspensionButton.layer.masksToBounds = YES; _suspensionButton.layer.cornerRadius = self.suspensionButton.frame.size.width/2; [_suspensionButton addTarget:self action:@selector(suspensionButtonClick) forControlEvents:UIControlEventTouchUpInside]; } return _suspensionButton;}- (void)suspensionButtonClick { }@end

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