iOS常見演算法(二分法 冒泡 選擇)二分法: 平均時間複雜度:O(log2n) int halfFuntion(int a[], int length, int number) { int start = 0; int end = length - 1; int index = 0; while(start < end) { index = start + (end - start)/2 if(a[index] == number){ return index; } else if(a[
iOS AV Foundation 二維碼掃描使用合成語音朗讀二維碼內容前一節,我們為程式識別到的二維碼提供了可視化的顯示,這一節,我們使用合成語音朗讀掃描到的二維碼的內容。修改ViewController.m,定義以下執行個體變數並進行初始化: AVSpeechSynthesizer *_speechSynthesizer;_speechSynthesizer = [[AVSpeechSynthesizer alloc]
IOS block編程指南 5 Block和變數Blocks and Variables(Block和變數)This article describes the interaction between blocks and variables, including memory management.本文講述了block和變數之間的內在關係,包括記憶體管理。Types of Variable(變數類型)Within the block object’s body of code,
Xcode編譯錯誤和警告匯總,xcode編譯匯總1、error: macro names must be identifiers YourProject_prefix.pch原因: 因為你弄髒了前置處理器宏,在它處於<Multiple Values>的時候修改了它解決方案: Configiration選擇All Configirations,清空它 然後分別重新定義你的Debug,Release,Distributin前置處理器宏吧 2、warning: no rule
獲得現在所有的是周幾,獲得有的是周代碼:- (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. NSLog(@"現在所在的周:%@",[self getWeekFromLocal]);
判斷textField裡面是否有空,判斷textField有空 : 代碼:- (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. //TextField UITextField *textField=[[UITextField