如果需要更改默认的UITextField清除按钮、左右视图等等控件的位置，可以通过如下设置：

// 控制清除按钮的位置 （默认 width = 15 = height）-(CGRect)clearButtonRectForBounds:(CGRect)bounds {//    NSLog(@"=%f ,=%f",bounds.origin.y,bounds.size.height/2);    return CGRectMake(bounds.origin.x + bounds.size.width - 50, (bounds.size.height - 15)/2, 15, 15);}// 控制placeHolder的位置 默认(0，0，width，height)-(CGRect)placeholderRectForBounds:(CGRect)bounds {    //    return CGRectInset(bounds, 20, 0);    CGRect inset = CGRectMake(bounds.origin.x + 50, bounds.origin.y, bounds.size.width - 10, bounds.size.height);    return inset;}// 控制显示文本的位置  默认(0,0,width,height)-(CGRect)textRectForBounds:(CGRect)bounds {        NSLog(@"显示文本==%@",NSStringFromCGRect(bounds));    //return CGRectInset(bounds, 50, 0);    CGRect inset = CGRectMake(bounds.origin.x + 190, 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 {        NSLog(@"编辑文本==%@",NSStringFromCGRect(bounds));    //return CGRectInset( bounds, 10 , 0 );    CGRect inset = CGRectMake(bounds.origin.x + 100, bounds.origin.y, bounds.size.width -10, bounds.size.height);    return inset;}// 控制左视图位置 （默认 width=30）- (CGRect)leftViewRectForBounds:(CGRect)bounds {        NSLog(@"左视图位置==%@",NSStringFromCGRect(bounds));        CGRect inset = CGRectMake(bounds.origin.x + 2, bounds.origin.y, 30, bounds.size.height);    return inset;    //return CGRectInset(bounds,50,0);}// 控制placeHolder的颜色、字体- (void)drawPlaceholderInRect:(CGRect)rect {        [[self placeholder] drawInRect:rect withAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:20.0f],                                                         NSForegroundColorAttributeName:[UIColor darkGrayColor]                                                         }];    }// 右视图的位置 (默认整个 width)- (CGRect)rightViewRectForBounds:(CGRect)bounds {        NSLog(@"右视图位置==%@",NSStringFromCGRect(bounds));        CGRect inset = CGRectMake(bounds.size.width - 30, bounds.origin.y, 30, bounds.size.height);    return inset;}