Button

button的标题居左显示：

居左：

button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;

距左11:

button.titleEdgeInsets = UIEdgeInsetsMake(0, 11, 0, 0);

将button布成左图片，右title的样式：

UIButton * leftButton = [UIButton buttonWithType:UIButtonTypeCustom];

leftButton.frame = CGRectMake(0, 0, 45, 30);

[leftButton setImage:[UIImage imageNamed:@"position"] forState:UIControlStateNormal];

[leftButton setTitle:@"切换" forState:UIControlStateNormal];

[leftButton addTarget:self action:@selector(changeAddress:) forControlEvents:UIControlEventTouchUpInside];

leftButton.titleLabel.font = [UIFont systemFontOfSize:14];

leftButton.imageEdgeInsets = UIEdgeInsetsMake(0, -5, 0, 0);

UIBarButtonItem * leftButtonItem = [[UIBarButtonItem alloc] initWithCustomView:leftButton];

self.navigationItem.leftBarButtonItem = leftButtonItem;

button根据状态不同变换颜色：

在button的点击事件中写：

[sender setSelected:!sender.isSelected];