iOS UITextField rightView覆盖clearButton的解决办法

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写一个UITextField的父类，重写UITextField内部边界绘制方法，更新UITextField内部控件布局

参考：http://www.jianshu.com/p/583d9f50e509

#import "CustomTextField.h"@implementation CustomTextField//控制清除按钮的位置-(CGRect)clearButtonRectForBounds:(CGRect)bounds{    return CGRectMake(bounds.origin.x + bounds.size.width - 55, bounds.origin.y, bounds.size.height, bounds.size.height);}//控制左视图位置- (CGRect)leftViewRectForBounds:(CGRect)bounds{    CGRect inset = CGRectMake(bounds.size.width-30, bounds.origin.y, bounds.size.width-250, bounds.size.height);    return inset;}//控制显示文本的位置-(CGRect)textRectForBounds:(CGRect)bounds{    CGRect inset = CGRectMake(bounds.origin.x+10, bounds.origin.y, bounds.size.width -10, bounds.size.height);      return inset;}//控制编辑文本的位置-(CGRect)editingRectForBounds:(CGRect)bounds{    CGRect inset = CGRectMake(bounds.origin.x +10, bounds.origin.y, bounds.size.width -10, bounds.size.height);    return inset;}@end

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