ios 比较两个 CGRects
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Comparing two CGRects
提问by Tim Vermeulen
I needed to check wether the frame of my view is equal to a given CGRect. I tried doing that like this:
我需要检查我的视图框架是否等于给定的 CGRect。我试着这样做：
CGRect rect = CGRectMake(20, 20, 20, 20);
if (self.view.frame == rect)
{
// do some stuff
}
However, I got an error saying Invalid operands to binary expression('CGRect' (aka 'struct CGRect') and 'CGRect'). Why can't I simply compare two CGRects?
但是，我收到一个错误说Invalid operands to binary expression('CGRect' (aka 'struct CGRect') and 'CGRect'). 为什么我不能简单地比较两个CGRects？
回答by Amelia777
Use this:
用这个：
if (CGRectEqualToRect(self.view.frame, rect)) {
// do some stuff
}
回答by James Sumners
See the documentationfor CGRectEqualToRect().
请参阅CGRectEqualToRect()的文档。
bool CGRectEqualToRect ( CGRect rect1, CGRect rect2 );
回答by Julian Król
In the Swift 3 it would be:
在 Swift 3 中，它将是：
frame1.equalTo(frame2)
回答by zumzum
In Swift simply using the ==or !=operators works for me:
在 Swift 中，只需使用==or!=运算符对我有用：
let rect = CGRect(x: 0, y: 0, width: 20, height: 20)
if rect != CGRect(x: 0, y: 0, width: 20, height: 21) {
print("not equal")
}
if rect == CGRect(x: 0, y: 0, width: 20, height: 20) {
print("equal")
}
debug console prints:
调试控制台打印：
not equal
equal
