从头开始－07.Foundation框架常用结构体

  //NSRange的使用
    NSRange r1 = NSMakeRange(2, 4);  //第一个参数为.location 第二个参数为.length
    
    NSString *str = @"学习OC";
    
    NSRange range = [str rangeOfString:@"学习"];  //查找某个字符串在str字符串中的位置和长度
    
    NSLog(@"loc = %ld, len = %ld",range.location, range.length);
    
    NSRange range1 = [str rangeOfString:@"找不到"];  //查找某个字符串在str字符串中的位置和长度
    
    NSLog(@"loc = %d, len = %ld",range1.location, range1.length);  //如果找不到，location 的返回值为-1,要用%d输出location 的值才会有负号，默认的%ld是没有符号
    
  
    
    //CGPoint的使用
    CGPoint point1 = NSMakePoint(10, 10);
    NSPoint point2 = CGPointMake(10, 10); //平常经常使用这种方法定义一个CGPoint 对象
    
    
    //NSSzie的使用
    NSSize size1 = CGSizeMake(10, 20);
    CGSize size2 = NSMakeSize(10, 20);
    
    
    //CGRect 的使用
    CGRect rect1 = CGRectMake(0, 0, 50, 50);
    CGRect rect2 = {point1, size1};
    
    
    //打印结构体的方法
    NSString *s = NSStringFromPoint(point1);
    NSLog(@"%@",s);
    
    NSString *s1 = NSStringFromRect(rect1);
    NSLog(@"%@",s1);

//判断结构体NSPoint\CGPoint、NSSize\CGSize、 NSRect\CGRect 包含的值是否相同的方法
    CGPointEqualToPoint(point1, point2);
    CGRectEqualToRect(rect1, rect2);
    CGRectEqualToRect(rect1, rect2);
    
    //判断某个rect是否包含某个点,必须引用框架CoreGraphic.framework,这样才能调用 CGRectContainsPoint方法
    BOOL b1 = CGRectContainsPoint(rect1, point1);
    NSLog(@"%d",b1);
    return 0;

    //创建字符串
    NSString *s1 = @"test";
    NSString *s2 = [[NSString alloc]initWithFormat:@"test is %c",‘c‘];
    
    //此方法可以将c语言字符串转化为OC字符串
    NSString *s3 = [[NSString alloc]initWithUTF8String:"name"];
    
    //OC字符串转化为C语言字符串
    const char *cs = [s3 UTF8String];
    
    NSString *s4 = [[NSString alloc] initWithContentsOfFile:@"/Users/lpmac/Desktop/my.text" encoding:NSUTF8StringEncoding error:nil];
    [NSString stringWithContentsOfFile:@"/Users/lpmac/Desktop/my.text" encoding:NSUTF8StringEncoding error:nil];
    
    
    
    NSURL *url = [[NSURL alloc]initWithString:@"file:///Users/lpmac/Desktop/my.text"];
    //类方法
    [NSURL URLWithString:@"file:///Users/lpmac/Desktop/my.text"];

    NSString *s5 = [[NSString alloc]initWithContentsOfURL:url encoding:NSUTF8StringEncoding error:nil];
     //类方法
    [NSString stringWithContentsOfFile:@"file:///Users/lpmac/Desktop/my.text" encoding:NSUTF8StringEncoding error:nil];
    NSLog(@"%@",s5);

    NSMutableString * mutableString1 = [NSMutableString stringWithFormat:@"test"];
    //拼接字符串
    [mutableString1 appendString:@"append str"];
    
    //删除
    NSRange range = [mutableString1 rangeOfString:@"test"];
    [mutableString1 deleteCharactersInRange:range];
    NSLog(@"%@",mutableString1);

  
    //数组的创建
    NSArray *array = [NSArray arrayWithObject:@"test"];
    NSArray *array1 = [NSArray arrayWithObjects:@"test1",@"test2",@"test2",nil];
    NSArray *array2 = @[@"test1",@"test2",@"test2"]; //提倡快速写法
    
    //数组访问
    [array1 objectAtIndex:0];
    array1[0]; //提倡
    
    //数组的遍历
    for (int i=0; i<array.count; i++) {
        NSLog(@"%@",array[i]);
    }

    //快速遍历
     for (id obj in array2) {
        
        NSUInteger loc = [array2 indexOfObject:obj];
         NSLog(@"%@,%ld",obj,loc);
       
    }
    
    
    [array2 enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
          NSLog(@"%@,%ld",obj,idx);
        if (idx == 1) {
            *stop = YES;
        }
    }];