一些有用的objective-c知识点1【转】

 

1获取系统语言设置

NSUserDefaults *userDefault = [NSUserDefaults standardUserDefaults];

NSArray *languages = [userDefault objectForKey:@”AppleLanguages”];

NSString *preferredLang = [languages objectAtIndex:0];

2缓存路径下文件大小

– (unsigned long long int) cacheFolderSize

{

NSFileManager  *_manager = [NSFileManager defaultManager];

NSArray *_cachePaths =  NSSearchPathForDirectoriesInDomains(NSCachesDirectory,
NSUserDomainMask, YES);

NSString  *_cacheDirectory = [_cachePaths objectAtIndex:];

NSArray  *_cacheFileList;

NSEnumerator *_cacheEnumerator;

NSString *_cacheFilePath;

unsigned long long int _cacheFolderSize = ;

_cacheFileList = [ _manager subpathsAtPath:_cacheDirectory];

_cacheEnumerator = [_cacheFileList objectEnumerator];

while (_cacheFilePath = [_cacheEnumerator nextObject])

{

NSDictionary *_cacheFileAttributes = [_managerfileAttributesAtPath:

[_cacheDirectory   stringByAppendingPathComponent:_cacheFilePath]

traverseLink:YES];

_cacheFolderSize += [_cacheFileAttributes fileSize];

}

// 单位是字节

return _cacheFolderSize;

}

3Popover push 时 Frame无法改变解决办法在popover中的ViewController中实现:

– (void)viewWillAppear:(BOOL)animated
{

CGSize size = CGSizeMake(320, 480); // size of view in popover

self.contentSizeForViewInPopover = size;

[super viewWillAppear:animated];

}

4tableview滑动导致NSTimer和委托回调停止解决办法

/ /请求回调

NSURLRequest  * 请求  =  …

scheduleInRunLoop :[ NSRunLoop  currentRunLoop ]
forMode :NSRunLoopCommonModes ]
[ 连接开始] / /定时器回调

NSTimer * updateTimer = [NSTimer scheduledTimerWithTimeInterval:0.01f目标:自我选择:选择(updatePencent)的UserInfo:无重复:是];

* NSRunLoop主要= [NSRunLoop currentRunLoop]
[主要addTimer:updateTimer forMode:NSRunLoopCommonModes];

5手势识别类

UIGestureRecognizer

6SFHFKeychainUtils 存储信息

苹果SDK自带的就有密码保护,使用方法很简单,如下:

1、引入Security.frameWork框架。

2、引入头文件:SFHKeychainUtils.h.

3、存密码:

[SFHFKeychainUtils storeUsername:@”dd” andPassword:@”aa”forServiceName:SERVICE_NAMEupdateExisting:1 error:nil];

[SFHFKeychainUtils deleteItemForUsername:@”dd” andServiceName:SERVICE_NAME error:nil];

4、取密码:

NSString *passWord =  [SFHFKeychainUtils getPasswordForUsername:@”dd”andServiceName:SERVICE_NAMEerror:nil];

7 missing required architecture i386 in file 解决办法

在TargetInfo里面修改 Framework Search Pasths 删除里面内容就可以了。

8view 放大缩小动画效果

//创建缩小了的视图
myWeiBoImageVC = [[UIViewController alloc] init];
myWeiBoImageVC.view.clipsToBounds = YES;
myWeiBoImageVC.view.alpha = 0.0;
myWeiBoImageVC.view.frame = CGRectMake(64, 0, 1024-64, 768-20);
[self.view addSubview:myWeiBoImageVC.view];

CGAffineTransform newTransform =
CGAffineTransformScale(myWeiBoImageVC.view.transform, 0.1, 0.1);
[myWeiBoImageVC.view setTransform:newTransform];
myWeiBoImageVC.view.center = CGPointMake(670, 100);

[self performSelector:@selector(imageViewControllerBigAnimation)];

//放大刚刚创建缩小后的视图
– (void)imageViewControllerBigAnimation{

[UIView beginAnimations:@”imageViewBig” context:nil];
[UIView setAnimationDuration:0.5];
CGAffineTransform newTransform =            CGAffineTransformConcat(myWeiBoImageVC.view.transform,  CGAffineTransformInvert(myWeiBoImageVC.view.transform));
[myWeiBoImageVC.view setTransform:newTransform];
myWeiBoImageVC.view.alpha = 1.0;
myWeiBoImageVC.view.center = CGPointMake(416, 510);
[UIView commitAnimations];

}

//缩小视图 隐藏

– (void)imageViewControllerSmallAnimation{

[UIView beginAnimations:@”imageViewSmall” context:nil];
[UIView setAnimationDuration:0.5];
CGAffineTransform newTransform =  CGAffineTransformScale(myWeiBoImageVC.view.transform, 0.1, 0.1);
[myWeiBoImageVC.view setTransform:newTransform];
myWeiBoImageVC.view.center = CGPointMake(670, 100);
[UIView commitAnimations];

}

9UIScrollView 控制View缩放

allImageScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 768, 1024)];
allImageScrollView.minimumZoomScale = 0.3;
allImageScrollView.maximumZoomScale = 1.0;
allImageScrollView.backgroundColor = [UIColor clearColor];
allImageScrollView.delegate = self;
[self.view addSubview:allImageScrollView];

mPicStatusesViewController = [[PicStatusesViewController alloc] init];
[allImageScrollView addSubview:mPicStatusesViewController.view];

//UIScrollView Delegete 实现

– (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView

{
return mPicStatusesViewController.view; //返回ScrollView上添加的需要缩放的视图
}

– (void)scrollViewDidZoom:(UIScrollView *)scrollView

{
//缩放操作中被调用
}

– (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale

{
//缩放结束后被调用
}

10、iOS3.2 播放视频

NSString *urlString = [NSString stringWithString:@”视频url”];

NSURL *movieUrl = [[NSURL alloc] initWithString:urlString];

MPMoviePlayerController *myMoviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:movieUrl];
myMoviePlayer.view.frame = CGRectMake(250, 250, 350, 350);
[self.view addSubview:myMoviePlayer.view];
myMoviePlayer.shouldAutoplay = YES;
myMoviePlayer.scalingMode= MPMovieScalingModeAspectFit;
[myMoviePlayer play];

 

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