TextField.leftView
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UITextField*testField = [[UITextFieldalloc]initWithFrame:CGRectMake(20,100,180,30)];
testField.borderStyle= UITextBorderStyleRoundedRect;
testField.borderStyle= UITextBorderStyleRoundedRect;
//开启左边视图出现模式
testField.leftViewMode= UITextFieldViewModeAlways;
testField.leftViewMode= UITextFieldViewModeAlways;
UIImageView *imageView = [[UIImageViewalloc]initWithFrame:CGRectMake(0,0,40,30)];
UIImage *image = [UIImageimageNamed:@"userName.png"];
imageView.image= image;
//设置TextField左边视图
testField.leftView= imageView;
[self.viewaddSubview:testField];
testField.leftView= imageView;
[self.viewaddSubview:testField];
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