关于UIView的位置都会遇到,一般需要改变UIView的位置,需要先获取原有的frame位置,然后在frame上面修改,有的时候如果只是改变了一下垂直方向的位置,宽度和高度的一种,这种写法很麻烦。下面两种写法第二种明显更简单,如果需要实现第二种方法就需要扩展UIView。
//1
CGRect frame=self.testView.frame;
frame.size.width=120;
self.testView.frame=frame;
[self printFrame];
//2
self.testView.width=120;
[self printFrame];
扩展定义:
@interface UIView (ReSize) @property (nonatomic, assign) CGSize size; @property (nonatomic,assign) CGFloat x; @property (nonatomic,assign) CGFloat y; @property (nonatomic, assign) CGFloat top; @property (nonatomic, assign) CGFloat bottom; @property (nonatomic, assign) CGFloat left; @property (nonatomic, assign) CGFloat right; @property (nonatomic, assign) CGFloat centerX; @property (nonatomic, assign) CGFloat centerY; @property (nonatomic, assign) CGFloat width; @property (nonatomic, assign) CGFloat height; @end
扩展实现:
@implementation UIView (ReSize) - (CGSize)size;
{
return [self frame].size;
} - (void)setSize:(CGSize)size;
{
CGPoint origin = [self frame].origin;
[self setFrame:CGRectMake(origin.x, origin.y, size.width, size.height)];
} -(CGFloat)x{
CGRect frame=[self frame];
return frame.origin.x;
} -(void)setX:(CGFloat)x{
CGRect frame=[self frame];
frame.origin.x=x;
[self setFrame:frame];
} -(CGFloat)y{
CGRect frame=[self frame];
return frame.origin.y;
} -(void)setY:(CGFloat)y{
CGRect frame=[self frame];
frame.origin.y=y;
return [self setFrame:frame];
} - (CGFloat)left;
{
return CGRectGetMinX([self frame]);
} - (void)setLeft:(CGFloat)x;
{
CGRect frame = [self frame];
frame.origin.x = x;
[self setFrame:frame];
} - (CGFloat)top;
{
return CGRectGetMinY([self frame]);
} - (void)setTop:(CGFloat)y;
{
CGRect frame = [self frame];
frame.origin.y = y;
[self setFrame:frame];
} - (CGFloat)right;
{
return CGRectGetMaxX([self frame]);
} - (void)setRight:(CGFloat)right;
{
CGRect frame = [self frame];
frame.origin.x = right - frame.size.width; [self setFrame:frame];
} - (CGFloat)bottom;
{
return CGRectGetMaxY([self frame]);
} - (void)setBottom:(CGFloat)bottom;
{
CGRect frame = [self frame];
frame.origin.y = bottom - frame.size.height;
[self setFrame:frame];
} - (CGFloat)centerX;
{
return [self center].x;
} - (void)setCenterX:(CGFloat)centerX;
{
[self setCenter:CGPointMake(centerX, self.center.y)];
} - (CGFloat)centerY;
{
return [self center].y;
} - (void)setCenterY:(CGFloat)centerY;
{
[self setCenter:CGPointMake(self.center.x, centerY)];
} - (CGFloat)width;
{
return CGRectGetWidth([self frame]);
} - (void)setWidth:(CGFloat)width;
{
CGRect frame = [self frame];
frame.size.width = width;
[self setFrame:CGRectStandardize(frame)];
} - (CGFloat)height;
{
return CGRectGetHeight([self frame]);
} - (void)setHeight:(CGFloat)height;
{
CGRect frame=[self frame];
frame.size.height = height;
[self setFrame:CGRectStandardize(frame)];
} @end