...
| Code Block | ||||
|---|---|---|---|---|
| ||||
typedef struct UIEdgeInsets {
CGFloat top, left, bottom, right; // specify amount to inset (positive) for each of the edges. values can be negative to 'outset'
} UIEdgeInsets; |
...
创建
| Code Block |
|---|
UIKIT_STATIC_INLINE UIEdgeInsets UIEdgeInsetsMake(CGFloat top, CGFloat left, CGFloat bottom, CGFloat right) {
UIEdgeInsets insets = {top, left, bottom, right};
return insets;
} |
...
| Code Block | ||||
|---|---|---|---|---|
| ||||
UIKIT_STATIC_INLINE CGRect UIEdgeInsetsInsetRect(CGRect rect, UIEdgeInsets insets) {
rect.origin.x += insets.left;//x轴右移left个单位（left<0时则左移）
rect.origin.y += insets.top;//y轴下移top个单位（top<0时则上移）
rect.size.width -= (insets.left + insets.right);//宽减少left+right
rect.size.height -= (insets.top + insets.bottom);//高减少top+bottom
return rect;
} |
这里需要注意的就是顺序问题。定义中是UIEdgeInsets insets = {top, left, bottom, right};
...
- left
- top
- left+right
- top+ bottom
例子
先看一个Catagory.目的是增加UIButton的相应范围.
| Code Block |
|---|
@implementation UIButton (TouchResponse)
- (void)touchResponseWithVector:(CGVector)vector {
DLog(@"self.frame:%@",NSStringFromCGRect(self.frame));
CGRect touchFrame = CGRectInset(self.frame, vector.dx, vector.dy);
DLog(@"touchFrame:%@",NSStringFromCGRect(touchFrame));
UIEdgeInsets edgeInsets = UIEdgeInsetsMake(-vector.dy, -vector.dx, -vector.dy, -vector.dx);
self.imageEdgeInsets = edgeInsets;
self.frame = touchFrame;
}
@end |