UIPickerView中的文字换行

Question

我有一个UIPickerView，其中没有显示全文。它在最后被截断。

如何显示2行或更多行的文本？

我试过下面的代码，但它仍然在单行显示，它不是完整的文本。

- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view{ 
    // Fill the label text here 
    NSString *title = @""; 

    UILabel* tView = (UILabel*)view; 
    if (!tView){ 
     CGRect frame = CGRectZero; 
     tView = [[UILabel alloc] initWithFrame:frame]; 
     [tView setFont:[UIFont fontWithName:@"Helvetica" size:15]]; 
     tView.minimumScaleFactor = 9.0f; 
     tView.adjustsFontSizeToFitWidth = YES; 
     tView.numberOfLines = 2; 

     [tView setText:title]; 
     [tView setTextAlignment:NSTextAlignmentLeft]; 
    } 

    return tView; 
} 

Answer 1

当我通过与UIFont创建类别类设置的自定义字体到应用程序，在UIPickerView文本被示出两行。

@implementation UIFont (CustomFont) 

+(UIFont *)regularFontWithSize:(CGFloat)size 
{ 
    return [UIFont fontWithName:GOATHAM_FONT size:size]; 
} 

+(UIFont *)boldFontWithSize:(CGFloat)size 
{ 
    return [UIFont fontWithName:GOATHAM_FONT size:size]; 
} 

+(void)load 
{ 
    SEL original = @selector(systemFontOfSize:); 
    SEL modified = @selector(regularFontWithSize:); 
    SEL originalBold = @selector(boldSystemFontOfSize:); 
    SEL modifiedBold = @selector(boldFontWithSize:); 

    Method originalMethod = class_getClassMethod(self, original); 
    Method modifiedMethod = class_getClassMethod(self, modified); 
    method_exchangeImplementations(originalMethod, modifiedMethod); 

    Method originalBoldMethod = class_getClassMethod(self, originalBold); 
    Method modifiedBoldMethod = class_getClassMethod(self, modifiedBold); 
    method_exchangeImplementations(originalBoldMethod, modifiedBoldMethod); 
} 

@end 

此外，我在UIPickerView委托方法中设置字体。

- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view{ 

    NSString *title = @""; 

    UILabel* tView = (UILabel*)view; 
    if (!tView){ 
     CGRect frame = CGRectZero; 
     tView = [[UILabel alloc] initWithFrame:frame]; 
     [tView setFont:[UIFont fontWithName:GOATHAM_FONT size:14]]; 
     tView.minimumScaleFactor = 9.0f; 
     tView.adjustsFontSizeToFitWidth = YES; 
     tView.numberOfLines = 2; 

     [tView setText:title]; 
     [tView setTextAlignment:NSTextAlignmentLeft]; 
    } 

    return tView; 
} 

这样做后，文本显示在UIPickerView中的两行。