xcode 开发小问题

需整理，有些不错的技巧

原文地址：http://blog.sina.com.cn/s/blog_64ea86850100n4lx.html

// 截屏

// UIGraphicsBeginImageContext(self.view.frame.size);

// [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];

// UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();

// UIGraphicsEndImageContext();

// UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil);

// 裁剪图片

-(UIImage *) cutFromImage:(UIImage *)image inRect:(CGRect)rect{

CGImageRef sourceImageRef = [image CGImage];

CGImageRef newImageRef = CGImageCreateWithImageInRect(sourceImageRef, rect);

UIImage *newImage = [UIImage imageWithCGImage:newImageRef];

return newImage;

}

// 缩放图片

- (UIImage *) scaleFromImage: (UIImage *) image toSize: (CGSize) size

{

UIGraphicsBeginImageContext(size);

[image drawInRect:CGRectMake(0, 0, size.width, size.height)];

UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return newImage;

}

// 相机的一些按钮效果设置

#pragma mark get/show the UIView we want

//Find the view we want in camera structure.

-(UIView *)findView:(UIView *)aView withName:(NSString *)name{

Class cl = [aView class];

NSString *desc = [cl description];



if ([name isEqualToString:desc])

return aView;



for (NSUInteger i = 0; i < [aView.subviews count]; i++)

{

UIView *subView = [aView.subviews objectAtIndex:i];

subView = [self findView:subView withName:name];

if (subView)

return subView;

}

return nil;

}

#pragma mark addSomeElements

-(void)addSomeElements:(UIViewController *)viewController{



UIView *viewTop = [[UIView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, screenWidth, (screenHeight-screenWidth)/2)];

[viewTop setAlpha:0.5f];

[viewTop setBackgroundColor:[UIColor blackColor]];

UIView *viewButtom = [[UIView alloc] initWithFrame:CGRectMake(0.0f, screenHeight-(screenHeight-screenWidth)/2, screenWidth, (screenHeight-screenWidth)/2)];

[viewButtom setAlpha:0.5f];

[viewButtom setBackgroundColor:[UIColor blackColor]];

//Add the motion view here, PLCameraView and picker.view are both OK

UIView *PLCameraView=[self findView:viewController.view withName:@"PLCameraView"];

[PLCameraView addSubview:viewTop];

[PLCameraView addSubview:viewButtom];

//Add label to cropOverlay

UIView *cropOverlay=[self findView:PLCameraView withName:@"PLCropOverlay"];

[cropOverlay addSubview:viewTop];

[cropOverlay addSubview:viewButtom];



[cropOverlay addSubview:m_viewActivity];

[cropOverlay addSubview:m_activity];



[viewTop release];

[viewButtom release];



//Get Bottom Bar

UIView *bottomBar=[self findView:PLCameraView withName:@"PLCropOverlayBottomBar"];



//Get ImageView For Save

UIImageView *bottomBarImageForSave = [bottomBar.subviews objectAtIndex:0];



//Get Button 0

UIButton *retakeButton= [bottomBarImageForSave.subviews objectAtIndex:0];

[retakeButton setTitle:@"重拍" forState:UIControlStateNormal];



//Get Button 1

UIButton *useButton= [bottomBarImageForSave.subviews objectAtIndex:1];

[useButton setTitle:@"保存" forState:UIControlStateNormal];



//Get ImageViewBar For Camera

UIImageView *bottomBarImageForCamera = [bottomBar.subviews objectAtIndex:1];



//Set Bottom Bar Image

// UIImage *image=[[UIImage alloc] initWithContentsOfFile:[[[NSBundle mainBundle] bundlePath] stringByAppendingPathComponent:@"BottomBar.png"]];

// bottomBarImageForCamera.image=image;

// [image release];



//Get Button 0(The Capture Button)

// UIButton *cameraButton = [bottomBarImageForCamera.subviews objectAtIndex:0];



//Get Button 1

UIButton *cancelButton=[bottomBarImageForCamera.subviews objectAtIndex:1];

[cancelButton setTitle:@"取消" forState:UIControlStateNormal];

}

#pragma mark UINavigationControllerDelegate

- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated{

[self stopActivity];

[self addSomeElements:viewController];

}

// 错误信息:initializer element is not constant

box2d 官方帮助有写的 你包含了c++文件 所以你需要把所有你的.m文件改成.mm文件

//农历转换函数

+(NSString *)LunarForSolar:(NSDate *)solarDate{

//天干名称

NSArray *cTianGan = [NSArray arrayWithObjects:@"甲",@"乙",@"丙",@"丁",@"戊",@"己",@"庚",@"辛",@"壬",@"癸", nil];



//地支名称

NSArray *cDiZhi = [NSArray arrayWithObjects:@"子",@"丑",@"寅",@"卯",@"辰",@"巳",@"午",@"未",@"申",@"酉",@"戌",@"亥",nil];



//属相名称

NSArray *cShuXiang = [NSArray arrayWithObjects:@"鼠",@"牛",@"虎",@"兔",@"龙",@"蛇",@"马",@"羊",@"猴",@"鸡",@"狗",@"猪",nil];



//农历日期名

NSArray *cDayName = [NSArray arrayWithObjects:@"*",@"初一",@"初二",@"初三",@"初四",@"初五",@"初六",@"初七",@"初八",@"初九",@"初十",

@"十一",@"十二",@"十三",@"十四",@"十五",@"十六",@"十七",@"十八",@"十九",@"二十",

@"廿一",@"廿二",@"廿三",@"廿四",@"廿五",@"廿六",@"廿七",@"廿八",@"廿九",@"三十",nil];



//农历月份名

NSArray *cMonName = [NSArray arrayWithObjects:@"*",@"正",@"二",@"三",@"四",@"五",@"六",@"七",@"八",@"九",@"十",@"十一",@"腊",nil];



//公历每月前面的天数

const int wMonthAdd[12] = {0,31,59,90,120,151,181,212,243,273,304,334};



//农历数据

const int wNongliData[100] = {2635,333387,1701,1748,267701,694,2391,133423,1175,396438

,3402,3749,331177,1453,694,201326,2350,465197,3221,3402

,400202,2901,1386,267611,605,2349,137515,2709,464533,1738

,2901,330421,1242,2651,199255,1323,529706,3733,1706,398762

,2741,1206,267438,2647,1318,204070,3477,461653,1386,2413

,330077,1197,2637,268877,3365,531109,2900,2922,398042,2395

,1179,267415,2635,661067,1701,1748,398772,2742,2391,330031

,1175,1611,200010,3749,527717,1452,2742,332397,2350,3222

,268949,3402,3493,133973,1386,464219,605,2349,334123,2709

,2890,267946,2773,592565,1210,2651,395863,1323,2707,265877};



static int wCurYear,wCurMonth,wCurDay;

static int nTheDate,nIsEnd,m,k,n,i,nBit;



//取当前公历年、月、日

NSDateComponents *components = [[NSCalendar currentCalendar] components:NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit fromDate:solarDate];

wCurYear = [components year];

wCurMonth = [components month];

wCurDay = [components day];



//计算到初始时间1921年2月8日的天数：1921-2-8(正月初一)

nTheDate = (wCurYear - 1921) * 365 + (wCurYear - 1921) / 4 + wCurDay + wMonthAdd[wCurMonth - 1] - 38;

if((!(wCurYear % 4)) && (wCurMonth > 2))

nTheDate = nTheDate + 1;



//计算农历天干、地支、月、日

nIsEnd = 0;

m = 0;

while(nIsEnd != 1)

{

if(wNongliData[m] < 4095)

k = 11;

else

k = 12;

n = k;

while(n>=0)

{

//获取wNongliData(m)的第n个二进制位的值

nBit = wNongliData[m];

for(i=1;i<n+1;i++)

nBit = nBit/2;



nBit = nBit % 2;



if (nTheDate <= (29 + nBit))

{

nIsEnd = 1;

break;

}



nTheDate = nTheDate - 29 - nBit;

n = n - 1;

}

if(nIsEnd)

break;

m = m + 1;

}

wCurYear = 1921 + m;

wCurMonth = k - n + 1;

wCurDay = nTheDate;

if (k == 12)

{

if (wCurMonth == wNongliData[m] / 65536 + 1)

wCurMonth = 1 - wCurMonth;

else if (wCurMonth > wNongliData[m] / 65536 + 1)

wCurMonth = wCurMonth - 1;

}



//生成农历天干、地支、属相

NSString *szShuXiang = (NSString *)[cShuXiang objectAtIndex:((wCurYear - 4) % 60) % 12];

NSString *szNongli = [NSString stringWithFormat:@"%@(%@%@)年",szShuXiang, (NSString *)[cTianGan objectAtIndex:((wCurYear - 4) % 60) % 10],(NSString *)[cDiZhi objectAtIndex:((wCurYear - 4) % 60) % 12]];



//生成农历月、日

NSString *szNongliDay;

if (wCurMonth < 1){

szNongliDay = [NSString stringWithFormat:@"闰%@",(NSString *)[cMonName objectAtIndex:-1 * wCurMonth]];

}

else{

szNongliDay = (NSString *)[cMonName objectAtIndex:wCurMonth];

}



NSString *lunarDate = [NSString stringWithFormat:@"%@ %@月 %@",szNongli,szNongliDay,(NSString *)[cDayName objectAtIndex:wCurDay]];



return lunarDate;

}

// 捕获键盘弹出隐藏的方法

[[NSNotificationCenter defaultCenter] addObserver:self

selector:@selector(keyboardWillShow:)

name:UIKeyboardWillShowNotification

object:nil];



[[NSNotificationCenter defaultCenter] addObserver:self

selector:@selector(keyboardWillHide:)

name:UIKeyboardWillHideNotification

object:nil];

-(void) keyboardWillShow:(NSNotification *)note {}

- (void)keyboardWillHide:(NSNotification *)note {}

// textview自动改变高度

CGSize _size = [[textView.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]] sizeWithFont:[UIFont boldSystemFontOfSize:14]];



int intTextViewWidth = textView.frame.size.width;

int row = (int) _size.width / (intTextViewWidth-10) + 1;

[textView setFrame:CGRectMake(20,100-row * _size.height, intTextViewWidth, row * _size.height + 14)];

textView.contentInset = UIEdgeInsetsZero;

// 为了防止自动改变高度中汉字提示在textview中出现，吧scroll禁用掉就ok。

[textView setScrollEnabled:NO];

// url地址有汉字转换

NSString *urlString = [NSString stringWithFormat:@"http:/%@",@"雷锋"];

NSString* strAfterDecodeByUTF8AndURI =

[urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

NSURL *url = [NSURL URLWithString: strAfterDecodeByUTF8AndURI];

// 格式化时间

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];

[formatter setDateFormat:@"YYMMddHHmm"];

int strDate = [[formatter stringFromDate:[NSDate date]] intValue];

[formatter release];

// 圆角

//给图层添加背景图片：

//myView.layer.contents = (id)[UIImage imageNamed:@"view_BG.png"].CGImage;

//将图层的边框设置为圆脚

myWebView.layer.cornerRadius = 8;

myWebView.layer.masksToBounds = YES;

//给图层添加一个有色边框

myWebView.layer.borderWidth = 5;

myWebView.layer.borderColor = [[UIColor colorWithRed:0.52 green:0.09 blue:0.07 alpha:1] CGColor];

// itunes打开你应用

NSString *str = [NSString stringWithFormat:

@"itms-apps://itunes.apple.com/cn/app/ya-mi-gao-er-fu-zhang-shang/id%d?mt=8",

APP_ADDRESS];

// ITUNES 打开你的评论

NSString *str = [NSString stringWithFormat:

@"itms-apps://ax.itunes.apple.com/WebObjects/MZStore.woa/wa/viewContentsUserReviews?type=Purple+Software&id=%d",

APP_ADDRESS];

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:str]];

// 监控键盘高度的改变

step 1：

在进入视图的时候添加监视：（viewDidLoad什么的）

//Observe keyboard hide and show notifications to resize the text view appropriately.

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];

step 2:

在键盘动作的时候移动视图：

- (void)keyboardWillShow:(NSNotification *)notification {

NSDictionary *userInfo = [notification userInfo];

// Get the origin of the keyboard when it's displayed.

NSValue* aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];

// Get the top of the keyboard as the y coordinate of its origin in self's view's coordinate system. The bottom of the text view's frame should align with the top of the keyboard's final position.

CGRect keyboardRect = [aValue CGRectValue];

keyboardRect = [self.view convertRect:keyboardRect fromView:nil];

CGFloat keyboardTop = keyboardRect.origin.y;

CGRect newTextViewFrame = self.view.bounds;

newTextViewFrame.size.height = keyboardTop - self.view.bounds.origin.y;

// Get the duration of the animation.

NSValue *animationDurationValue = [userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey];

NSTimeInterval animationDuration;

[animationDurationValue getValue:&animationDuration];

// Animate the resize of the text view's frame in sync with the keyboard's appearance.

[UIView beginAnimations:nil context:NULL];

[UIView setAnimationDuration:animationDuration];

textView.frame = newTextViewFrame;

[UIView commitAnimations];

}

- (void)keyboardWillHide:(NSNotification *)notification {

NSDictionary* userInfo = [notification userInfo];

NSValue *animationDurationValue = [userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey];

NSTimeInterval animationDuration;

[animationDurationValue getValue:&animationDuration];

[UIView beginAnimations:nil context:NULL];

[UIView setAnimationDuration:animationDuration];

textView.frame = self.view.bounds;

[UIView commitAnimations];

}

step 3:

在退出视图的时候注销通知

viewDidUnload:

[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];

[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];

dealloc:

[[NSNotificationCenter defaultCenter] removeObserver:self name:nil object:nil];