为什么这个 NSLog 代码打印值的零？
为什么这个 Objective-C 代码打印 0 的值，就像在调试器中一样，我可以看到它们有非 0 值：
代码
CGRect currFrame = label.frame;
currFrame.origin.y = currVertPos;
currFrame.origin.x = 0;
currFrame.size.height = expectedLabelSize.height;
currFrame.size.width = maxWidt h;
NSLog(@" currFrame dimensions:x/y/height/width = %d / %d / %d / %d", 0, currVertPos, expectedLabelSize.height, maxWidth);
打印内容
currFrame dimensions:x/y/height/width = 0 / 0 / 0 / 0
Why does this objective-c code print 0's for the values, where as in debugger I can see they have non-0 values:
Code
CGRect currFrame = label.frame;
currFrame.origin.y = currVertPos;
currFrame.origin.x = 0;
currFrame.size.height = expectedLabelSize.height;
currFrame.size.width = maxWidt h;
NSLog(@" currFrame dimensions:x/y/height/width = %d / %d / %d / %d", 0, currVertPos, expectedLabelSize.height, maxWidth);
What is Printed
currFrame dimensions:x/y/height/width = 0 / 0 / 0 / 0
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所有这些值都有 CGFloat 类型，但您试图将它们打印为 int 。只需将
%d替换为%f即可。PS Apple 开发人员偶尔需要打印 CGRect，因此他们想出了一些方便的方法。尝试 NSLog(@"currFrame 尺寸：%@", NSStringFromCGRect(currFrame))。
All these values have
CGFloattype but you're trying to print them asints. Just replace%dwith%f.P.S. Apple devs have to print
CGRects occasionally so they came up with some handy methods. TryNSLog(@"currFrame dimensions: %@", NSStringFromCGRect(currFrame)).因为您使用的是
%d因此将数字格式化为整数。尝试使用%f或%lf代替：Because you are using
%dhence formatting the number as integers. Try using%for%lfinstead: