int a = 1;
char b = 'a';
//可以用来把基本数据类型封装成oc的对象
NSNumber* num = [NSNumber numberWithInt:a];
NSLog(@"%@", num);
//得到number存的int数据的值
a = [num floatValue];
NSMutableArray* array = [NSMutableArray arrayWithCapacity:0];
[array addObject:num];
NSNumber* c = [NSNumber numberWithChar:b];
[array addObject:c];
NSNumber* f = [NSNumber numberWithFloat:1.23];
[array addObject:f];
//如果对存入浮点数的nsnumber对象使用intValue得到整数部分
CGFloat ff = [f intValue];
NSLog(@"%f", ff);
[array writeToFile:@"/Users/4dworks/Desktop/num.plist" atomically:YES];
NSString* str = @"1234";
//把字符串转换成基本数据类型
NSLog(@"%f", [str floatValue]);
//用来表示范围
// NSRange
//表示平面上面的一个点 core graphics
CGPoint p = NSMakePoint(10, 11);
p.x = 12;
p.y = 13;
//表示一个矩形大小
CGSize size = NSMakeSize(10, 10);
size.width = 20;
size.height = 30;
//可以用来表示一个控件在屏幕上的位置和大小
CGRect rect = NSMakeRect(0, 0, 10, 10);
rect.size = size;
rect.origin = p;
//把给定的CGPoint结构体封装成NSValue对象
NSValue* value = [NSValue valueWithPoint:p];
CGPoint point = [value pointValue];
NSValue* value1 = [NSValue valueWithRect:rect];
rect = [value1 rectValue];
NSValue* value2 = [NSValue valueWithSize:size];
size = [value2 sizeValue];
NSRange range = NSMakeRange(0, 200);
NSValue* value3 = [NSValue valueWithRange:range];
range = [value3 rangeValue];
NSLog(@"%@", NSStringFromRange(range));
NSLog(@"%@", NSStringFromRect(rect));
NSLog(@"%@", NSStringFromPoint(point));
NSLog(@"%@", NSStringFromSize(size));
struct student {
int age;
char* name;
};
struct student stu = {10, "tom"};
NSLog(@"%s", @encode(struct student));
//第一个参数要封装数据的地址
//第二个给封装的数据一个标记
NSValue* v = [NSValue value:&stu withObjCType:@encode(struct student)];
struct student stu1;
[v getValue:&stu1];
NSLog(@"%i %s", stu1.age, stu1.name);
NSLog(@"%s", [v objCType]);
int x = 1;
NSValue* v1 = [NSValue value:&x withObjCType:@encode(int)];
[v1 getValue:&x];
NSLog(@"%d", x);
//得到是当前的日期
NSDate* date = [NSDate date];
NSLog(@"%@", date);
NSDateFormatter* formatter = [[NSDateFormatter alloc] init];
[formatter setDateStyle:NSDateFormatterNoStyle];
NSString* dateStr = [formatter stringFromDate:date];
// formatter
NSLog(@"%@", dateStr);
//怎么样得到当前年,月,日,时,分,秒
//得到一个日历对象
NSCalendar* calendar = [NSCalendar currentCalendar];
//通过给定的日期还有给定的一个flag得到date里面的那些部分
NSDateComponents* components = [calendar components:NSYearCalendarUnit fromDate:date];
NSLog(@"%ld", [components year]);
NSDateComponents* c2 = [calendar components:NSMonthCalendarUnit fromDate:date];
NSLog(@"%ld", [c2 month]);
//00000000 11111010
NSDateComponents* c3 = [calendar components:NSYearCalendarUnit|NSDayCalendarUnit|NSHourCalendarUnit|NSMinuteCalendarUnit|NSSecondCalendarUnit fromDate:date];
NSLog(@"%ld", [c3 year]);
NSLog(@"%ld", [c3 month]);
NSLog(@"%ld", [c3 day]);
NSLog(@"%ld", [c3 hour]);
NSLog(@"%ld", [c3 minute]);
NSLog(@"%ld", [c3 second]);
NSLog(@"");
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