在iOS 7上UISearchBar左对齐占位符文本？

在iOS 7 UISearchBar上,占位符文本居中,我想禁用它,并使其始终像以前一样粘在左边.

有一个私有的方法setCenterPlaceholder,在diff和调用这个与BOOL将做出旅程. https://gist.github.com/nscoding/7220368

@interface NSCodingSearchBar : UISearchBar

// Default by the system is YES.
// https://github.com/nst/iOS-Runtime-Headers/blob/master/Frameworks/UIKit.framework/UISearchBar.h
@property (nonatomic,assign,setter = setHasCentredPlaceholder:) BOOL hasCentredPlaceholder;

@end

执行文件

#import "NSCodingSearchBar.h"


// ------------------------------------------------------------------------------------------


@implementation NSCodingSearchBar


// ------------------------------------------------------------------------------------------
#pragma mark - Initializers
// ------------------------------------------------------------------------------------------
- (instancetype)initWithFrame:(CGRect)frame
{
    if ((self = [super initWithFrame:frame]))
    {
        self.hasCentredPlaceholder = YES;
    }

    return self;
}


// ------------------------------------------------------------------------------------------
#pragma mark - Methods
// ------------------------------------------------------------------------------------------
- (void)setHasCentredPlaceholder:(BOOL)hasCentredPlaceholder
{
    _hasCentredPlaceholder = hasCentredPlaceholder;

    SEL centerSelector = NSSelectorFromString([NSString stringWithFormat:@"%@%@",@"setCenter",@"Placeholder:"]);
    if ([self respondsToSelector:centerSelector])
    {
        NSMethodSignature *signature = [[UISearchBar class] instanceMethodSignatureForSelector:centerSelector];
        NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:signature];
        [invocation setTarget:self];
        [invocation setSelector:centerSelector];
        [invocation setArgument:&_hasCentredPlaceholder atIndex:2];
        [invocation invoke];
    }

}


@end

我想知道是否有其他的,不是“哈奇的方式”做同样的事情.

解决方法

要在iOS7中保留占位符的左对齐方式,您可以在占位符字符串的末尾添加空格.例如：

_searchBar.placeholder = @"Search                  ";

请注意,应该为每个搜索栏和每种语言单独完成.

可以尝试在任何语言的文本之后自动计算所需的空格,但是似乎不可能读取searchBar的textField框架的大小

<UISearchBarTextField: 0x1349c160; frame = (0 0; 0 0);

在iOS 7上UISearchBar左对齐占位符文本？

解决方法

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