为什么此NSLog代码将值打印为零? [英] why does this NSLog code print zero's for the values?

问题描述

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:

Why does this objective-c code print 0's for the values, where as in debugger I can see they have non-0 values:

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);

打印的内容

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

推荐答案

因为您使用的是％d ，因此将数字格式化为整数.尝试改用％f 或％lf :

Because you are using %d hence formatting the number as integers. Try using %f or %lf instead:

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

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