ipad 视频播放器的渐变播放效果

实现视频播放的渐变切换效果，可以修改代码在iphone上使用。

//
//  FLWPlayer.h
//
//  Created by [e-mail] on 11-10-28.
//  Copyright 2011 littleWorn inc. All rights reserved.
//

#import <UIKit/UIKit.h>
#import <MediaPlayer/MediaPlayer.h>
@class FLWPlayer;

@protocol FLWPlayerDelegate <NSObject>
-(void)singleTapView:(FLWPlayer*)view;
@end

//interface
@interface FLWPlayer : UIView{
@private
	id<FLWPlayerDelegate>_delegate;
	MPMoviePlayerController *_player;
	NSURL *_url;
}
@property(assign)			id<FLWPlayerDelegate> delegate;
@property(nonatomic,retain) NSURL *url;
@property(nonatomic,retain) MPMoviePlayerController *player;

-(id)initWithURL:(NSURL*)url;
-(id)initWithFrame:(CGRect)frame url:(NSURL*)url;

-(void)play;
-(void)stop;
-(void)pause;
@end

//
//  FLWPlayer.m
//
//  Created by [e-mail] on 11-10-28.
//  Copyright 2011 littleWorn inc. All rights reserved.
//
#import "FLWPlayer.h"

@implementation FLWPlayer
@synthesize delegate = _delegate;
@synthesize url = _url;
@synthesize player = _player;

#pragma mark life cycle
- (void)dealloc {
	[_delegate release];
	[_url release];
	[_player release];
    [super dealloc];
}

//init
-(id)init{
	if (self = [super init]) {
		//去掉状态栏
		[[UIApplication sharedApplication] setStatusBarHidden:YES];
		
		UITapGestureRecognizer *tg = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(singleTap)];
		tg.numberOfTapsRequired = 2;
		[self addGestureRecognizer:tg];
		[tg release];
	}
	return self;
}

-(id)initWithFrame:(CGRect)frame{
	if (self = [super initWithFrame:frame]) {
		//去掉状态栏
		[[UIApplication sharedApplication] setStatusBarHidden:YES];
		
		UITapGestureRecognizer *tg = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(singleTap)];
		tg.numberOfTapsRequired = 2;
		[self addGestureRecognizer:tg];
		[tg release];
	}
	return self;
}

-(id)initWithURL:(NSURL*)url{
	if (self = [super init]) {
		self.url = url;
		
		//去掉状态栏
		[[UIApplication sharedApplication] setStatusBarHidden:YES];
		
		UITapGestureRecognizer *tg = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(singleTap)];
		tg.numberOfTapsRequired = 2;
		[self addGestureRecognizer:tg];
		[tg release];
	}
	return self;
}

-(id)initWithFrame:(CGRect)frame url:(NSURL*)url{
	if (self = [super initWithFrame:frame]) {
		self.url = url;
		
		//去掉状态栏
		[[UIApplication sharedApplication] setStatusBarHidden:YES];
		
		UITapGestureRecognizer *tg = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(singleTap)];
		tg.numberOfTapsRequired = 2;
		[self addGestureRecognizer:tg];
		[tg release];
	}
	return self;
}

-(void)singleTap{
	[self.delegate singleTapView:self];
}

#pragma mark overide
//-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
//	[self.delegate singleTapView:self];
//}


//播放视频
-(void)play{
	//覆盖
	UIView *cover = [[UIView alloc] initWithFrame:CGRectMake(0,0, 1024, 768)];
	cover.tag = 100;
	cover.backgroundColor = [UIColor blackColor];
	cover.alpha = 0.0f;
	//添加覆盖视图实现渐变退出效果
	[UIView beginAnimations:nil context:nil];
	[UIView setAnimationDuration:0.4f];
	[UIView setAnimationDelay:0.2f];
	[UIView setAnimationDelegate:self];
	[UIView setAnimationDidStopSelector:@selector(stopPlaying)];
	cover.alpha = 1.0f;
	[UIView commitAnimations];
	[self addSubview:cover];
	[cover release];
	self.backgroundColor = [UIColor blackColor];
}
//开始播放
-(void)startToPlay{
	if (nil == self.url) {
		return;
	}
	
	//清除覆盖
	UIView *cover = [self viewWithTag:100];
	if (cover) {
		[cover removeFromSuperview];
	}
	//加载视频
	if (_player) {
		[_player setContentURL:self.url];
	}else {
		self.player = [[MPMoviePlayerController alloc] initWithContentURL:self.url];
		_player.view.frame = CGRectMake(0, 0, 1024, 768);
		_player.controlStyle= MPMovieControlStyleNone;
		_player.repeatMode = MPMovieRepeatModeOne;
		[_player setFullscreen:YES];
		[self addSubview:_player.view];
		[_player release];
	}
	//开始播放
	[_player prepareToPlay];
	[_player play];
	
	//渐变进入
	_player.view.alpha = 0.0f;
	_player.backgroundView.backgroundColor = [UIColor blackColor];
	[UIView beginAnimations:nil context:nil];
	[UIView setAnimationDuration:1.0f];
	_player.view.alpha = 1.0f;
	[UIView commitAnimations];
}

//停止正在播放的视频
-(void)stopPlaying{
	[self stop];
	[self startToPlay];
}

//停止播放
-(void)stop{
	if (_player) {
		[_player stop];
	}
}

//暂停播放
-(void)pause{
	if (_player) {
		[_player pause];
	}
}
@end