iOS UITextField rightView覆盖clear

参考：http://blog.csdn.net/a394318511/article/details/8025170

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

#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