IOS笔记汇集
1.iOS调用相册和摄像头
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
UIImageView *imageView = [[UIImageView alloc] init];
imageView.frame = CGRectMake(0, 0, 80, 120);
imageView.backgroundColor = [UIColor greenColor];
imageView.tag = 101;
[self.view addSubview:imageView];
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button.frame = CGRectMake(0, 200, 100, 30);
[button setTitle:@"打开相册" forState:UIControlStateNormal];
[button addTarget:self action:@selector(openPics) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];
UIButton *button2 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button2.frame = CGRectMake(0, 300, 100, 30);
[button2 setTitle:@"打开相机" forState:UIControlStateNormal];
[button2 addTarget:self action:@selector(openCamera) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button2];
}
// 打开相机
- (void)openCamera {
// UIImagePickerControllerCameraDeviceRear 后置摄像头
// UIImagePickerControllerCameraDeviceFront 前置摄像头
BOOL isCamera = [UIImagePickerController isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceRear];
if (!isCamera) {
NSLog(@"没有摄像头");
return ;
}
UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
imagePicker.delegate = self;
// 编辑模式
imagePicker.allowsEditing = YES;
[self presentViewController:imagePicker animated:YES completion:^{
}];
}
// 打开相册
- (void)openPics {
UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
imagePicker.delegate = self;
[self presentViewController:imagePicker animated:YES completion:^{
}];
}
// 选中照片
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
NSLog(@"%@", info);
UIImageView *imageView = (UIImageView *)[self.view viewWithTag:101];
// UIImagePickerControllerOriginalImage 原始图片
// UIImagePickerControllerEditedImage 编辑后图片
UIImage *image = [info objectForKey:UIImagePickerControllerEditedImage];
imageView.image = image;
[picker dismissViewControllerAnimated:YES completion:NULL];
}
// 取消相册
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
[picker dismissViewControllerAnimated:YES completion:NULL];
}
2.ASIHttpRequest框架使用
要使用ASIRequest必须添加5个动态库，CFNetwork.framework、SystemConfigureation.framework、MobileCoreServices.framework、libz.dylib和libxml2.dylib
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
[request setRequestMethod:@"GET"];
[request setTimeOutSeconds:60];
// 设置请求头
// [request setRequestHeaders:<#(NSMutableDictionary *)#>]
// 设置cookies
// [request setRequestCookies:<#(NSMutableArray *)#>]
// 发送同步请求
[request startSynchronous];
NSError *error = request.error;
if (error == nil) {
NSData *data = request.responseData;
UIImage *img = [UIImage imageWithData:data];
NSLog(@"%@", data);
self.image = img;
} else {
NSLog(@"请求网络出错:%@", error);
}
3.iOS Http请求异步请求
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
_data = [[NSMutableData alloc] init];
// 组合一个搜索字符串
NSString *urlStr = [NSString stringWithFormat:@"http://www.baidu.com/s?wd=%@", @"php"];
NSURL *url = [NSURL URLWithString:urlStr];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
//发起请求，定义代理
[NSURLConnection connectionWithRequest:request delegate:self];
}
// 分批返回数据
- (void)connection:(NSURLConnection *) connection didReceiveData:(NSData *)data {
[_data appendData:data];
NSLog(@"%@", _data);
}
// 数据完全返回完毕
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
NSString *dataString = [[NSString alloc] initWithData:_data encoding:NSUTF8StringEncoding];
NSLog(@"%@", dataString);
}
4.iOS Http get 请求
// 组合一个搜索字符串
NSString *urlStr = [NSString stringWithFormat:@"http://www.baidu.com/s?wd=%@", @"php"];
// 字符串转化为URL
NSURL *url = [NSURL URLWithString:urlStr];
// NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
// [request setURL:url];
// [request setHTTPMethod:@"POST"];
// [request setTimeoutInterval:60];
// [request setHTTPBody:_data];
// [request setValue:@"ttt" forHTTPHeaderField:@"cookies"];
// url转化为一个请求
NSURLRequest *request = [NSURLRequest requestWithURL:url];
// 状态请求
NSURLResponse *response;
// 链接一个请求
NSData *resultData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:nil];
// 返回数据转为字符串
NSData *dataString = [[NSString alloc] initWithData:resultData encoding:NSUTF8StringEncoding];
NSLog(@"%@", dataString);
// 解析json吧
5.NSURL 基本方法
NSURL *url = [NSURL URLWithString:@"http://www.baidu.com/search?id=1"];
NSLog(@"scheme:%@", [url scheme]); //协议 http
NSLog(@"host:%@", [url host]); //域名 www.baidu.com
NSLog(@"absoluteString:%@", [url absoluteString]); //完整的url字符串 http://www.baidu.com:8080/search?id=1
NSLog(@"relativePath: %@", [url relativePath]); //相对路径 search
NSLog(@"port :%@", [url port]); // 端口 8080
NSLog(@"path: %@", [url path]); // 路径 search
NSLog(@"pathComponents:%@", [url pathComponents]); // search
NSLog(@"Query:%@", [url query]); //参数 id=1
6.软件打开滑动导航 UIScrollView
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
_scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 340, 460)];
_scrollView.backgroundColor = [UIColor whiteColor];
_scrollView.delegate = self;
_scrollView.pagingEnabled = YES;
_scrollView.tag = INT_MAX;
_scrollView.showsHorizontalScrollIndicator = NO;
_scrollView.contentSize = CGSizeMake(340 * 4, 460);
[self.view addSubview:_scrollView];
int _x = 0;
for (int index = 0; index < 4; index++) {
UIImageView *imgScrollView = [[UIImageView alloc] initWithFrame:CGRectMake(0+_x, 0, 320, 460)];
imgScrollView.tag = index;
NSString *imgName = [NSString stringWithFormat:@"%d.JPG", index + 1];
imgScrollView.image = [UIImage imageNamed:imgName];
[_scrollView addSubview:imgScrollView];
_x += 340;
}
UIPageControl *pageControl = [[UIPageControl alloc] initWithFrame:CGRectMake(0, 180, 320, 50)];
pageControl.numberOfPages = 4;
pageControl.tag = 101;
[self.view addSubview:pageControl];
[pageControl release];
}
- (void) scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
int current = scrollView.contentOffset.x / 320;
UIPageControl *pageControl = (UIPageControl *)[self.view viewWithTag:101];
pageControl.currentPage = current;
}
7.Objective-c 类初始化参数
#import <Foundation/Foundation.h>
@interface obj : NSObject
{
NSString *_name;
}
-(id) initWithName:(NSString *) name;
-(void) setName:(NSString *)name;
-(NSString *) getName;
@end
@implementation obj
-(NSString *) getName {
return _name;
}
-(void)setName:(NSString *) name {
_name = name;
}
// 初始化方法，带参数
-(id) initWithName:(NSString *) name {
// 调用父类init 生成类
self = [super init];
if (self) {
// 执行自己的方法
[self setName:name];
}
return self;
}
@end
int main(int argc, char *argv[]) {
@autoreleasepool {
obj *o = [[obj alloc] initWithName:@"wangdk"];
NSLog(@"name is %@", [o getName]);
}
}
8.Objective-c 处理动态类型的方法
#import <Foundation/Foundation.h>
//-(BOOL) isKindOfClass:class // 对象是不是class或其子类成员
//-(BOOL) isMemberOfClass:class // 对象是不是class的成员
//-(BOOL) respondsToSelector:selector // 对象是否能够相应selector所指定的方法
//+(BOOL) instancesRespondToSelector:selector // 指定对象实力是否能响应selector
//+(BOOL) isSubclassOfClass:class // 对象是否指定类的子类
//-(id) performSwlector:selector // 应用selector指定的方法
//-(id) perforumSelector:selector widthObject:object // 应用selector指定方法传参object
@interface obj : NSObject
@end
@implementation obj
@end
@interface obj2 : obj
-(void)setName;
@end
@implementation obj2
-(void)setName {
}
@end
int main(int argc, char *argv[]) {
@autoreleasepool {
obj *o = [[obj2 alloc] init];
// 判断 o 是不是属于obj 实例或子类实例
if ([o isKindOfClass: [obj class]] == YES) {
NSLog(@" obj is a Kind of o class");
}
// 判断 o 是不是属于 obj 实例
if ([o isMemberOfClass:[obj class]] == YES ) {
NSLog(@"obj is member of class of o class");
}
// 判断o是否可以响应setName方法
if ([o respondsToSelector:@selector(setName)] == YES) {
NSLog(@" o respondsToSelector setName");
}
}
}
9.IOS获取当月天数
NSCalendar *calendar = [NSCalendar currentCalendar];
unsigned unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit;
NSDateComponents *components = [calendar components:unitFlags fromDate:[NSDate date]];
NSInteger iCurYear = [components year]; //当前的年份
NSInteger iCurMonth = [components month]; //当前的月份
NSInteger iCurDay = [components day]; // 当前的号数
NSString *dateStr = nil;
NSMutableArray *arr = [NSMutableArray array];
for (NSInteger i = 1; i <= iCurDay; i++) {
dateStr = [NSString stringWithFormat:@"%d-%d-%d", iCurYear, iCurMonth, i];
[arr addObject:dateStr];
}
_arrayList = [arr copy];
10.UITableDelgate 几种代理方法
#pragma mark - TableView delegate
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
if (indexPath.row == 0 && indexPath.section == 2) {
return 80; // 第三个section中第一行
}return 44;
} // 设置行高
- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
if (section == 0) {
return 44;
}return 25;
} // 设置section header的高度
- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section
{
if (section == 12) {
return 80;
}return 50;
} // 设置section footer的高度
/*
- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
UIView *headerView = [[UIView alloc] initWithFrame:CGRectZero];
headerView.backgroundColor = [UIColor cyanColor];
return [headerView autorelease];
}*/ // 设置section自定义头部视图
- (UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section
{
UIView *footerView = [[UIView alloc] initWithFrame:CGRectZero];
footerView.backgroundColor = [UIColor cyanColor];
UILabel *tipLabel = [[UILabel alloc] initWithFrame:CGRectMake(60, 0, 200, 30)];
tipLabel.numberOfLines = 0;
tipLabel.textAlignment = NSTextAlignmentCenter;
tipLabel.text = [NSString stringWithFormat:@"section footer %d", section+1];
[footerView addSubview:tipLabel];
[tipLabel release];
return [footerView autorelease];
} // 设置section自定义尾部视图