首行縮排可以利用textfield的leftView做事

UILabel *usernameLeftView = [[UILabel alloc] initWithFrame:CGRectMake(0.f, 0.f, 10.f, 0.f)];
    usernameLeftView.backgroundColor = [UIColor clearColor];
    textField.leftView = usernameLeftView;

游標顏色：textField.tintColor = [UIColor blackColor];

清除樣式：textField.clearButtonMode = UITextFieldViewModeWhileEditing;（常用方法）

typedef NS_ENUM(NSInteger, UITextFieldViewMode) {
    UITextFieldViewModeNever,／／從不
    UITextFieldViewModeWhileEditing,／／編輯時
    UITextFieldViewModeUnlessEditing,／／不在編輯狀態時
    UITextFieldViewModeAlways／／總是
};

最終樣式：加了邊框的