iphone - 为什么此NSLog代码将值打印为零？

Question

为什么此Objective-C代码为值打印0，在调试器中我看到它们具有非0值:

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);

打印什么

currFrame dimensions:x/y/height/width = 0 / 0 / 0 / 0

Answer 1

因为您使用的是%d，所以将数字格式化为整数。尝试改用%f或%lf:

NSLog(@"  currFrame dimensions:x/y/height/width = %f / %f / %f / %f", 0, currVertPos, expectedLabelSize.height, maxWidth);