OC入门教程

时间：2020-05-17 16:50:37

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OC入门教程

一、入门教程

入门教程1

入门教程2

二、类基本用法

@interface MyObject : NSObject { //声明interfaceint memberVar1; // 实体变量默认protected属性id memberVar2;@public//自定义public属性NSString *name;}+(return_type) class_method; // 类方法，类似static-(return_type) instance_method1; // 实例方法-(return_type) instance_method2: (int) p1;-(return_type) instance_method3: (int) p1 andPar: (int) p2;@end@implementation MyObject { //定义implementationint memberVar3; //默认private属性}+(return_type) class_method {.... //method implementation}-(return_type) instance_method1 {....}-(return_type) instance_method2: (int) p1 {....}-(return_type) instance_method3: (int) p1 andPar: (int) p2 {....}@end调用方法示例: MyObject *justTest =[MyObject alloc]; //实例方法[justTest instance_method1 ]; ...//类方法可直接使用类名调用// [MyObject class_method]; 协议（纯虚继承，需要实现接口的方法）@protocol Locking //协议- (void)lock;- (void)unlock;@end@interface SomeClass : SomeSuperClass <Locking>@end@implementation SomeClass- (void)lock {// 實現lock方法...}- (void)unlock {// 實現unlock方法...}@end

三、协议与委托

#import <Foundation/Foundation.h> @protocol PrintProtocolDelegate - (void)processCompleted; @end //委托的作用：一个类如PrintClass类调用结束后，通知使用它的另外一个类SampleClass@interface PrintClass :NSObject { id delegate; } - (void) printDetails; - (void) setDelegate:(id)newDelegate; @end @implementation PrintClass - (void)printDetails { NSLog(@"Printing Details"); [delegate processCompleted]; } - (void) setDelegate:(id)newDelegate { delegate = newDelegate; } @end@interface SampleClass:NSObject<PrintProtocolDelegate> - (void)startAction; @end @implementation SampleClass - (void)startAction { PrintClass *printClass = [[PrintClass alloc]init]; [printClass setDelegate:self]; [printClass printDetails]; } -(void)processCompleted { NSLog(@"Printing Process Completed"); } @end int main(int argc, const char * argv[]) { NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; SampleClass *sampleClass = [[SampleClass alloc]init]; [sampleClass startAction]; [pool drain]; return 0; }

四、动态调用

- setMyValue:(id) foo; //id形态表示参数"foo"可以是任何类的实例- setMyValue:(id <aProtocol>) foo; //id<aProtocol>表示"foo"可以是任何类的实例，但必须采纳"aProtocol"协议- setMyValue:(NSNumber*) foo; //该声明表示"foo"必须是"NSNumber"的实例

六、iOS - NSLog打印（精准打印）

/p/5b5798976feb

NSLog(@“打印字符串：%@”,name);

NSLog(@“打印整形：%i”,number);//或者 %li ; %ld ; %d

NSLog(@“打印字符：%c”,c);

NSLog(@“打印单浮点数：%f”,f);

NSLog(@“打印精度浮点数：%.2f”,f);

NSLog(@“BOOL–b-->%@”,isYES?@“YES”😡“NO”);//打印布尔类型

七、字符串基本操作

/wangyurui_wyr/article/details/52457534NSString *str1 = @"mingtian*";NSString *str2 = @"nihao*";NSString *str3 = [NSString stringWithFormat:@"%@%@",str1,str2];

八、数据转换

Object - C 入门之数据类型详解/shulianghan/article/details/38544659

NSDictionary、NSMutableDictionary的各种实用的用法以及枚举

/ylwdi/article/details/46814523

/u014220518/article/details/50945177

1、 Int 转NSNumberint iValue；NSNumber *number = [NSNumber numberWithInt:iValue];2、 NSNumber 转Intint myInt = [number intValue];；3、NSString转intNSString *stringInt = @“120”;int ivalue = [stringInt intValue];4、int转NSStringNSString *string = [NSString stringWithFormat:@"%d",ivalue];

NSString用法//1.基本用法NSString *greeting = @"Hello";//2.nstring添加字符串NSString* string; // 结果字符串NSString* string1, string2; //已存在的字符串，需要将string1和string2连接起来//方法1. string = [NSString initWithFormat:@"%@,%@", string1, string2 ];//方法2. string = [string1 stringByAppendingString:string2];//方法3 . string = [string stringByAppendingFormat:@"%@,%@",string1, string2];

九、# \Log

#import <Foundation/Foundation.h>

int main()

{

NSLog(@“File :%s\n”,FILE);

NSLog(@“Date :%s\n”,DATE);

NSLog(@“Time :%s\n”,TIME);

NSLog(@“Line :%d\n”,LINE);

NSLog(@“ANSI :%d\n”,STDC);

return 0;

}