1:運行程序報the file couldn't be opened because you don't have permission to view it
解決辦法：項目—>targets->build settings->build options->changed the value of the "Compiler for C/C++/Objective-C" to Default Compiler.
2:百度地圖引用
1.1如圖引用的是.framework形式開發包時，引入的命名空間則是#import <BaiduMapAPI/BMapKit.h>//引入所有的頭文件#import <BaiduMapAPI/BMKMapView.h>//只引入所需的單個頭文件如果是引入用的是.a形式開發包時，引入的命名空間則是#import “BMapKit.h"1.2百度地圖現在提供的兩個.framework的包，一個是真機一個是測試機，可以使用終端的命令把它合成一個；
3:自定義大頭針百度地圖
- (void)viewDidLoad { [super viewDidLoad]; //百度地圖初始化 _mapView=[[BMKMapView alloc] initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT-NAVBARHEIGHT)]; _mapView.delegate=self; [self.view addSubview:_mapView]; //標出坐標點 [self addPointAnnotation];}//添加標注- (void)addPointAnnotation{ for (int i=0; i<self.coordinates.count; i++) { coordinateBean *model=self.coordinates[i]; BMKPointAnnotation* pointAnnotation = [[BMKPointAnnotation alloc]init]; CLLocationCoordinate2D coor; coor.latitude = model.latitude; coor.longitude = model.longitude; pointAnnotation.coordinate = coor; //通過title來起到傳值的作用 pointAnnotation.title=[NSString stringWithFormat:@"%d",i]; [_mapView addAnnotation:pointAnnotation]; //顯示彈出窗 [_mapView selectAnnotation:pointAnnotation animated:YES]; //判斷那個是中心，沒有則0必傳參數 if (i==self.selectIndex) { BMKCoordinateRegion region; ////表示范圍的結構體 region.center.latitude = model.latitude;// 中心中 region.center.longitude = model.longitude; region.span.latitudeDelta = 0;//經度范圍（設置為0.1表示顯示范圍為0.2的緯度范圍） region.span.longitudeDelta = 0;//緯度范圍 [_mapView setRegion:region]; } }}//處理自定義彈出視圖- (BMKAnnotationView *)mapView:(BMKMapView *)mapView viewForAnnotation:(id <BMKAnnotation>)annotation{ if ([annotation isKindOfClass:[BMKPointAnnotation class]]) { BMKPinAnnotationView *newAnnotationView = [[BMKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"myrenameMark"]; newAnnotationView.pinColor = BMKPinAnnotationColorPurple; newAnnotationView.animatesDrop = YES;// 設置該標注點動畫顯示 newAnnotationView.image = [UIImage imageNamed:self.mapPointImageName]; //把大頭針換成別的圖片 int selectIndex=[((BMKPointAnnotation *)annotation).title intValue]; //獲得值 coordinateBean *model=[self.coordinates objectAtIndex:[((BMKPointAnnotation *)annotation).title intValue]]; UIView *popView=[[UIView alloc]initWithFrame:CGRectMake(0, 3, 100, 20)]; UIImage *img=[UIImage imageNamed:@"mapViewBackground"]; UIEdgeInsets edge=UIEdgeInsetsMake(0, 20, 0, 10); img=[img resizableImageWithCapInsets:edge resizingMode:UIImageResizingModeStretch]; UIImageView *myimage=[[UIImageView alloc] initWithImage:img]; myimage.frame=CGRectMake(30, 0, 100, 40); myimage.userInteractionEnabled=YES; [popView addSubview:myimage]; //自定義顯示的內容 UILabel *driverName = [[UILabel alloc]initWithFrame:CGRectMake(0, 3, 100, 15)]; driverName.backgroundColor=[UIColor clearColor]; driverName.text=model.title; driverName.font = [UIFont systemFontOfSize:12]; driverName.textColor = [UIColor blackColor]; driverName.textAlignment = NSTextAlignmentLeft; [myimage addSubview:driverName]; UILabel *carName = [[UILabel alloc]initWithFrame:CGRectMake(0, 18, 100, 15)]; carName.backgroundColor=[UIColor clearColor]; carName.text=model.comments; carName.font = [UIFont systemFontOfSize:12]; carName.textColor = [UIColor blackColor]; carName.textAlignment = NSTextAlignmentLeft; [myimage addSubview:carName]; BMKActionPaopaoView *pView = [[BMKActionPaopaoView alloc]initWithCustomView:popView]; pView.frame = CGRectMake(0, 0, 100, 40); ((BMKPinAnnotationView*)newAnnotationView).paopaoView = nil; ((BMKPinAnnotationView*)newAnnotationView).paopaoView = pView; newAnnotationView.tag=selectIndex+10; return newAnnotationView; } return nil;}- (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated.}/** * @author wujunyang, 15-05-12 13:05:05 * * @brief 跟對百度地圖的處理 * @param animated <#animated description#> */-(void)viewWillAppear:(BOOL)animated{ [_mapView viewWillAppear]; _mapView.delegate=self; _locationService.delegate=self;}/** * @author wujunyang, 15-01-06 10:01:53 * * 跟對百度地圖的處理 * * @param animated <#animated description#> */-(void)viewWillDisappear:(BOOL)animated{ [_mapView viewWillDisappear]; _mapView.delegate=nil; _locationService.delegate=nil；}其中有個自定義model:@interface coordinateBean : NSObject//緯度@PRoperty(assign,nonatomic)float latitude;//經度@property(assign,nonatomic)float longitude;//標題@property(strong,nonatomic)NSString *title;//注解@property(strong,nonatomic)NSString *comments;@end
4：自動隱藏和顯示工具欄和導航條
toolbar屬性、toolbarItems與上一講的navigationBar、navigationItem類似。只不過toolbarItems沒有navigationItem的左右區分，它就自己一個人在做事，相當于沒有下屬?？梢栽趖oolbar上設置很多，比如背景顏色、背景圖片、背景樣式、大小位置（不過有些貌似設置無效），當然和navigationBar一樣，對于它的是否顯示和隱藏是由它的老爸即navigationController控制的。所以[self.navigationController setNavigationBarHidden:YES animated:YES];也會把底部的toolBarItems給隱藏起來，如果要隱藏導航又不想底部toolBarItems被隱藏掉，可以用普通的view替代toolBarItems;首先在viewDidLoad里設置toolBarHidden = NO, 默認是YES（隱藏的）為了讓toolbar顯示，需要設置為NO（不隱藏）。- (void)viewDidLoad{ [super viewDidLoad]; self.title = @"隱藏導航欄"; // self.toolbarItems self.navigationController.toolbar.barStyle = self.toolBar.barStyle; self.navigationController.toolbarHidden = NO; [self.navigationController.toolbar setTranslucent:YES]; self.toolbarItems = [[[NSMutableArray alloc] initWithArray:self.toolBar.items] autorelease];} 在點擊中間button的時候的顯示和隱藏navigation bar和toolBar實現代碼如下：- (IBAction)toggleNavigationBar:(id)sender{ //Check the current state of the navigation bar... BOOL navBarState = [self.navigationController isNavigationBarHidden]; //Set the navigationBarHidden to the opposite of the current state. [self.navigationController setNavigationBarHidden:!navBarState animated:YES]; [self.navigationController setToolbarHidden:!navBarState animated:YES]; //Change the label on the button. if (navBarState) { [button setTitle:@"隱藏 Navigationr and toolbar" forState:UIControlStateNormal]; [button setTitle:@"隱藏 Navigation Bar toolbar" forState:UIControlStateHighlighted]; } else { [button setTitle:@"顯示 Navigation Bar toolbar" forState:UIControlStateNormal]; [button setTitle:@"顯示 Navigation Bar toolbar" forState:UIControlStateHighlighted]; }}
5：View代碼結構的一些建議
在viewDidload里面只做addSubview的事情，然后在viewWillAppear里面做布局的事情，最后在viewDidAppear里面做Notification的監聽之類的事情。至于屬性的初始化，則交給getter去做。@interface CustomObject()@property (nonatomic, strong) UILabel *label;@end@implement#pragma mark - life cycle- (void)viewDidLoad{ [super viewDidLoad]; [self.view addSubview:self.label];}- (void)viewWillAppear:(BOOL)animated{ [super viewWillAppear:animated]; self.label.frame = CGRectMake(1, 2, 3, 4);}#pragma mark - getters and setters- (UILabel *)label{ if (_label == nil) { _label = [[UILabel alloc] init]; _label.text = @"1234"; _label.font = [UIFont systemFontOfSize:12]; ... ... } return label;}@end注意：*重點，在get方法里面不能寫self.noLabel；千萬不要用“點”語法，這樣會造成get方法死循環，因為“點”語法就是調用的get方法，所以要用下劃線屬性名的方法得到對象（在內存這其實是一個指針）。
@interface MasonryViewController ()@property(nonatomic,strong)UIView *conView;@property(nonatomic,assign)int intstate;@end@implementation MasonryViewController- (void)viewDidLoad { [super viewDidLoad]; [self.view addSubview:self.conView];}//懶加載-(UIView *)conView{ if(_conView==nil) { _conView=[[UIView alloc]init]; _conView.backgroundColor=[UIColor redColor]; } return _conView;}-(int)intstate{ _intstate=0; return _intstate;}//布局約束-(void)viewDidLayoutSubviews{ [self.conView mas_makeConstraints:^(MASConstraintMaker *make) { make.top.equalTo(self.view.mas_top).with.offset(100); make.left.equalTo(self.view.mas_left).with.offset(60); make.right.equalTo(self.view.mas_right).with.offset(0); make.height.equalTo(@50); }];}- (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning];}
6: iOS中的生成隨機數方法
生成0-x之間的隨機正整數int value =arc4random_uniform(x ＋ 1);生成隨機正整數int value = arc4random() 通過arc4random() 獲取0到x-1之間的整數的代碼如下：int value = arc4random() % x; 獲取1到x之間的整數的代碼如下: int value = (arc4random() % x) + 1; 最后如果想生成一個浮點數，可以在項目中定義如下宏：#define ARC4RANDOM_MAX 0x100000000 然后就可以使用arc4random() 來獲取0到100之間浮點數了（精度是rand（）的兩倍），代碼如下：double val = floorf(((double)arc4random() / ARC4RANDOM_MAX) * 100.0f);實例(從數組中隨機顯示出一個背景圖,再通過網絡加載顯示出來): self.bgView=[[UIImageView alloc] initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT)]; self.bgView.image=[UIImage imageNamed:@"AppBg"]; [self.view addSubview:self.bgView]; [self.view sendSubviewToBack:self.bgView]; NSDictionary *params=[[NSDictionary alloc] init]; [[HomeMainNetAPIManager sharedManager] getBackgroundImage:params andBlock:^(id data, NSError *error) { if (!error&&data) { BackgroundImageBean *groundImagebean =(BackgroundImageBean *)data; int dataNum=groundImagebean.data.count; if (groundImagebean.data&&dataNum>0) { int r=arc4random_uniform(dataNum); GroundImageBean *curBean=groundImagebean.data[r]; [self.bgView sd_setImageWithURL:[NSURL URLWithString:curBean.ImgUrl] placeholderImage:[UIImage imageNamed:@"AppBg"] completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) { dispatch_async(dispatch_get_main_queue(), ^{ self.bgView.image=image; }); }]; } } }];
7：沙盒路徑知識整理
模擬器的路徑從之前的~/Library/application Support/iPhone Simulator移動到了~/Library/Developer/CoreSimulator/Devices/文件都在個人用戶名文件夾下的一個隱藏文件夾里，中文叫資源庫，他的目錄其實是Library。因為應用是在沙箱（sandbox）中的，在文件讀寫權限上受到限制，只能在幾個目錄下讀寫文件：Documents：應用中用戶數據可以放在這里，iTunes備份和恢復的時候會包括此目錄tmp：存放臨時文件，iTunes不會備份和恢復此目錄，此目錄下文件可能會在應用退出后刪除Library/Caches：存放緩存文件，iTunes不會備份此目錄，此目錄下文件不會在應用退出刪除iTunes在與iPhone同步時，備份所有的Documents和Library文件。iPhone在重啟時，會丟棄所有的tmp文件。查看方法：方法1、可以設置顯示隱藏文件，然后在Finder下直接打開。設置查看隱藏文件的方法如下：打開終端，輸入命名(1)顯示Mac隱藏文件的命令：defaults write com.apple.finder AppleShowAllFiles -bool true(2)隱藏Mac隱藏文件的命令：defaults write com.apple.finder AppleShowAllFiles -bool false(3)輸完單擊Enter鍵，退出終端，重新啟動Finder就可以了 重啟Finder：鼠標單擊窗口左上角的蘋果標志-->強制退出-->Finder-->現在能看到資源庫文件夾了。 打開資源庫后找到/Application Support/iPhone Simulator/文件夾。這里面就是模擬器的各個程序的沙盒目錄了。方法2、這種方法更方便，在Finder上點->前往->前往文件夾，輸入/Users/username/Library/Application Support/iPhone Simulator/ 前往。username這里寫用戶名。 自定義類返回各目錄路徑：#import <Foundation/Foundation.h>@interface ICSandboxHelper : NSObject+ (NSString *)homePath; // 程序主目錄，可見子目錄(3個):Documents、Library、tmp+ (NSString *)appPath; // 程序目錄，不能存任何東西+ (NSString *)docPath; // 文檔目錄，需要ITUNES同步備份的數據存這里，可存放用戶數據+ (NSString *)libPrefPath; // 配置目錄，配置文件存這里+ (NSString *)libCachePath; // 緩存目錄，系統永遠不會刪除這里的文件，ITUNES會刪除+ (NSString *)tmpPath; // 臨時緩存目錄，APP退出后，系統可能會刪除這里的內容+ (BOOL)hasLive:(NSString *)path; //判斷目錄是否存在，不存在則創建實現代碼:#import "ICSandboxHelper.h"@implementation ICSandboxHelper+ (NSString *)homePath{ return NSHomeDirectory();}+ (NSString *)appPath{ NSArray * paths = NSSearchPathForDirectoriesInDomains(NSApplicationDirectory, NSUserDomainMask, YES); return [paths objectAtIndex:0];}+ (NSString *)docPath{ NSArray * paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); return [paths objectAtIndex:0];}+ (NSString *)libPrefPath{ NSArray * paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES); return [[paths objectAtIndex:0] stringByAppendingFormat:@"/Preference"];}+ (NSString *)libCachePath{ NSArray * paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES); return [[paths objectAtIndex:0] stringByAppendingFormat:@"/Caches"];}+ (NSString *)tmpPath{return [NSHomeDirectory() stringByAppendingFormat:@"/tmp"];}+ (BOOL)hasLive:(NSString *)path{ if ( NO == [[NSFileManager defaultManager] fileExistsAtPath:path] ) { return [[NSFileManager defaultManager] createDirectoryAtPath:path withIntermediateDirectories:YES attributes:nil error:NULL]; } return NO;}
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