iOS中button上得文字右对齐

例子如下：

[cpp] view
plaincopy

CGRect btnRect = CGRectMake(

360 * 0.5f,

352 * 0.5f,

107,

49

);

m_iknowBtn = [[UIButton alloc] initWithFrame:btnRect];

[m_iknowBtn setTitle:FoolLocalizedString(@"知道了", nil) forState:UIControlStateNormal];

[m_iknowBtn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];

m_iknowBtn.titleLabel.font = [UIFont systemFontOfSize:18];

m_iknowBtn.titleLabel.adjustsFontSizeToFitWidth = YES;

m_iknowBtn.titleLabel.minimumFontSize = 5;

[m_iknowBtn setTitleEdgeInsets:UIEdgeInsetsMake(0, 10, 18, 0)];

[m_iknowBtn setBackgroundImage:[UIImage imageNamed:@"ipad_goodluck_iknow_btn.png"] forState:UIControlStateNormal];

[m_iknowBtn addTarget:self action:@selector(closeLayer) forControlEvents:UIControlEventTouchUpInside];

关键在：

[m_iknowBtn setTitleEdgeInsets:UIEdgeInsetsMake(0, 10, 18, 0)];
其中
UIKIT_STATIC_INLINE UIEdgeInsets UIEdgeInsetsMake(CGFloat top, CGFloat left, CGFloat bottom,CGFloat right)
{
UIEdgeInsets insets = {top, left, bottom, right};
return insets;
}
表示
这个表示title往右边偏移10像素，往上面偏移18像素。
第一个参数top如果为正表示往下偏移，第二个参数left如果为正表示往右偏远，第三个参数bottom如果为正表示往上偏移，第四个参数right如果为正表示往左偏移。

//右对齐

[login_bt setContentHorizontalAlignment:UIControlContentHorizontalAlignmentRight];