@段松 老师有7年的iOS研发经验，一线大牛我喜欢，奇幻之旅就正式开始吧。
iOS 开发和盖房子差不多，那么我们就先学习一些基本建筑材料:数据类型与操作符。后面还有一些数组、运算符、流程控制语句、枚举、结构体和宏定义等。
虽然这些之前都有学过，也算温故知新吧。和 Swift 相比确实繁琐古老的一些。
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| NSInteger age = 18;
NSInteger testAge;
testAge = age >= 18 ? 1 : 0;
if (testAge) {
NSLog(@"你已经是个成年人了");
} else {
NSLog(@"你还是未成年人");
}
char name[] = "Will";
printf(name);
NSInteger price = 4;
switch (price) {
case 4: {
NSLog(@"four");
NSLog(@"more than one line.");
break;
}
case 3:
NSLog(@"three");
break;
case 2:
NSLog(@"two");
break;
default:
break;
}
bool isFemale = false;
BOOL isMale = YES;
if (isMale) {
if (!isFemale) {
NSLog(@"You are a ture man.");
}
}
// 循环
int sum = 0;
for (int i = 1; i <= 100; ++i) {
sum += i;
}
NSLog(@"%i", sum);
int sum1 = 0;
int j = 1;
for ( ; ; ) {
sum1 += j;
j++;
if (j > 100) {
break;
}
}
NSLog(@"%i", sum1);
// 枚举
enum Person {GoodGirl, GodBoy, BadGirl, BadBoy};
enum Person someone;
someone = GodBoy;
if (someone != BadBoy && someone != BadGirl) {
NSLog(@"Someone is a good person.");
}
// 结构体
typedef struct {CGFloat x; CGFloat y;} MyPoint;
MyPoint myPoint = {6, 8};
CGFloat result = myPoint.x + myPoint.y;
NSLog(@"result = %f", result);
// #define 宏：文本替换
#define PI 3.1415926
#define SQUARE(x) ((x)*(x))
NSLog(@"%f", PI * SQUARE(5 - 4)); // 3.141593
NSLog(@"%.7f", PI * SQUARE(5 - 4)); // 3.1415926
NSLog(@"%e", PI * SQUARE(5 - 4)); // 3.141593e+00
// #import 导入文件
// #import "example.h"
// 条件编译
#ifdef __OBJC__
#import <Foundation/Foundation.h>
#endif
|