Objective-C中常用的结构体NSRange,NSPoint,NSSize(CGSize),NSRect

本节要点：红色标记 需要记下来

1 NSRange

typedef struct _NSRange {
NSUInteger location;
NSUInteger length;
} NSRange;
NSMakeRange 的函数

NS_INLINEz是内联函数

typedef NSRange *NSRangePointer;

NS_INLINE NSRange NSMakeRange(NSUInteger loc, NSUInteger len) {
NSRange r;
r.location = loc;
r.length = len;
return r;
}
使用方法

//NSRange表示的是范围
NSRange range;
range.location = 18;
range.length = 34;

NSLog(@"location is %zi",range.location);
NSLog(@"length is %zi",range.length);

//快速创建
range = NSMakeRange(8, 10);
NSLog(@"location is %zi",range.location);
NSLog(@"length is %zi",range.length);

//NSStringFromRange将上面的结构体转化成字符串类型,打印出来

NSString* str1 = NSStringFromRange(range);

//%@是一个OC对象,range代表的是一个结构体,str是一个OC对象
NSLog(@"rang is %@",str1);
2 NSPoint

NSPoint的原型

struct CGPoint {
CGFloat x;
CGFloat y;
};
NSMakePoint函数

NS_INLINE NSPoint NSMakePoint(CGFloat x, CGFloat y) {
NSPoint p;
p.x = x;
p.y = y;
return p;
}
CGPointMake函数

CGPointMake(CGFloat x, CGFloat y)
{
CGPoint p; p.x = x; p.y = y; return p;
}
使用方法

//NSPoint指的是位置
NSPoint point;

//给结构体里面的点进行赋值
point.x = 10;
point.y = 10;

//快速创建点
point = NSMakePoint(10, 18);

//常见的是CGPointMake创建点的函数
point = CGPointMake(29, 78);
NSString* str2 = NSStringFromPoint(point);
NSLog(@"point is %@",str2);
3 CGSize

CGSize的原型

struct CGSize {
CGFloat width;
CGFloat height;
};
NSMakeSize函数

NS_INLINE NSSize NSMakeSize(CGFloat w, CGFloat h) {
NSSize s;
s.width = w;
s.height = h;
return s;
}
CGSizeMake函数

CGSizeMake(CGFloat width, CGFloat height)
{
CGSize size; size.width = width; size.height = height; return size;
}
使用方法

NSSize size;

size.width = 100;
size.height = 12;
size = NSMakeSize(12, 12);
size = CGSizeMake(11, 11);

NSString* str3 = NSStringFromSize(size);
NSLog(@"%@",str3);
4 CGRect

CGRect的原型

struct CGRect {
CGPoint origin;
CGSize size;
};
CGRectMake的函数

CGRectMake(CGFloat x, CGFloat y, CGFloat width, CGFloat height)
{
CGRect rect;
rect.origin.x = x; rect.origin.y = y;
rect.size.width = width; rect.size.height = height;
return rect;
}
NSMakeRect函数

NS_INLINE NSRect NSMakeRect(CGFloat x, CGFloat y, CGFloat w, CGFloat h) {
NSRect r;
r.origin.x = x;
r.origin.y = y;
r.size.width = w;
r.size.height = h;
return r;
}
使用方法

//既包含了尺寸大小和位置
NSRect rect;
rect.origin.x = 12;
rect.origin.y = 14;
rect.size.width = 12;
rect.size.height = 15;

//快速创建方法
rect = CGRectMake(12, 12, 12, 12);
rect = NSMakeRect(11, 11, 11, 11);

//转化成字符串打印出来
NSString* str5 = NSStringFromRect(rect);
NSLog(@"rect is %@",str5);