iphone - 大小和字体 :forwidth:linebreakmode

Question

为什么这行不通？无论字符串的长度如何，它总是返回 18。有 this thread ，但不是确定的答案。

    NSString * t = @"<insert super super long string here>";

    CGSize size = [t sizeWithFont:[UIFont systemFontOfSize:14.0] forWidth:285 lineBreakMode:UILineBreakModeWordWrap];

    NSLog(@"size.height is %f and text is %@", size.height, t);

谢谢，

托德

Answer 1

改用 sizeWithFont:constrainedToSize:lineBreakMode:。

NSString * t = @"<insert super super long string here>";
CGSize constrainSize = CGSizeMake(285, MAXFLOAT);
CGSize size = [t sizeWithFont:[UIFont systemFontOfSize:14.0] constrainedToSize:constrainSize lineBreakMode:UILineBreakModeWordWrap];
NSLog(@"size.height is %f and text is %@", size.height, t);